Korean Math Dataset
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ํ๊ตญ์ด ์ํ ๋ฐ์ดํฐ (๋ด๊ฐ ํธ์งํ ๊ฒ ์์ฃผ)
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0 | $\frac{m}{n}$ is the Irreducible fraction value of \[3+\frac{1}{3+\frac{1}{3+\frac13}}\], what is the value of $m+n$? | $\frac{m}{n}$์ \[3+\frac{1}{3+\frac{1}{3+\frac13}}\]์ ๊ธฐ์ฝ๋ถ์ ๊ฐ์ด๋ค. $m+n$์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 142 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_1 |
1 | How many ways are there to split the integers $1$ through $14$ into $7$ pairs such that in each pair, the greater number is at least $2$ times the lesser number? | ์ ์ $1$๋ถํฐ $14$๊น์ง๋ฅผ $7$๊ฐ์ ์์ผ๋ก ๋๋๋ ๋ฐฉ๋ฒ์ ์๋ ๋ช ๊ฐ์ธ๊ฐ? ๋จ, ๊ฐ ์์์ ํฐ ์๋ ์์ ์์ ์ ์ด๋ $2$๋ฐฐ ์ด์์ด์ด์ผ ํ๋ค. | 144 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_10 |
2 | What is the product of all real numbers $x$ such that the distance on the number line between $\log_6x$ and $\log_69$ is twice the distance on the number line between $\log_610$ and $1$? | ์์ง์ ์์ $\log_6x$์ $\log_69$ ์ฌ์ด์ ๊ฑฐ๋ฆฌ๊ฐ $\log_610$๊ณผ $1$ ์ฌ์ด์ ๊ฑฐ๋ฆฌ์ ๋ ๋ฐฐ๊ฐ ๋๋ ๋ชจ๋ ์ค์ $x$์ ๊ณฑ์ ์ผ๋ง์ธ๊ฐ? | 81 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_11 |
3 | Let $M$ be the midpoint of $\overline{AB}$ in regular tetrahedron $ABCD$. $\frac{p}{q}=\cos(\angle CMD)$ is irreducible fraction, what is the value of $p+q$? | ์ ์ฌ๋ฉด์ฒด $ABCD$์์ $\overline{AB}$์ ์ค์ ์ $M$์ด๋ผ๊ณ ํ์. $\frac{p}{q}=\cos(\angle CMD)$๊ฐ ๊ธฐ์ฝ๋ถ์์ผ ๋, $p+q$์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 4 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_12 |
4 | Let $\mathcal{R}$ be the region in the complex plane consisting of all complex numbers $z$ that can be written as the sum of complex numbers $z_1$ and $z_2$, where $z_1$ lies on the segment with endpoints $3$ and $4i$, and $z_2$ has magnitude at most $1$. What integer is closest to the area of $\mathcal{R}$? | ๋ณต์ํ๋ฉด์์ ์์ญ $\mathcal{R}$์ ๋ ๋ณต์์ $z_1$๊ณผ $z_2$์ ํฉ์ผ๋ก ๋ํ๋ผ ์ ์๋ ๋ชจ๋ ๋ณต์์ $z$๋ก ๊ตฌ์ฑ๋๋ค. ์ฌ๊ธฐ์ $z_1$์ ๋์ ์ด $3$๊ณผ $4i$์ธ ์ ๋ถ ์์ ์๊ณ , $z_2$์ ํฌ๊ธฐ๊ฐ ์ต๋ $1$์ธ ๋ณต์์์
๋๋ค. $\mathcal{R}$์ ๋์ด์ ๊ฐ์ฅ ๊ฐ๊น์ด ์ ์๋ ๋ฌด์์
๋๊น? | 13 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_13 |
5 | What is the value of \[(\log 5)^{3}+(\log 20)^{3}+(\log 8)(\log 0.25)\] where $\log$ denotes the base-ten logarithm? | ๋ฐ์ด 10์ธ ๋ก๊ทธ $\log$๋ฅผ ์ฌ์ฉํ ๋, \[(\log 5)^{3}+(\log 20)^{3}+(\log 8)(\log 0.25)\]์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 2 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_14 |
6 | The roots of the polynomial $10x^3 - 39x^2 + 29x - 6$ are the height, length, and width of a rectangular box (right rectangular prism). A new rectangular box is formed by lengthening each edge of the original box by $2$
units. What is the volume of the new box? | ๋คํญ์ $10x^3 - 39x^2 + 29x - 6$์ ๊ทผ์ ์ง์ก๋ฉด์ฒด์ ๋์ด, ๊ธธ์ด, ๋๋น์ด๋ค. ์๋ ์ง์ก๋ฉด์ฒด์ ๊ฐ ๋ชจ์๋ฆฌ์ ๊ธธ์ด๋ฅผ $2$ ๋งํผ ๋๋ ค ์๋ก์ด ์ง์ก๋ฉด์ฒด๋ฅผ ๋ง๋ค์๋ค. ์๋ก์ด ์ง์ก๋ฉด์ฒด์ ๋ถํผ๋ ์ผ๋ง์ธ๊ฐ? | 30 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_15 |
7 | A $\emph{triangular number}$ is a positive integer that can be expressed in the form $t_n = 1+2+3+\cdots+n$, for some positive integer $n$. The three smallest triangular numbers that are also perfect squares are
$t_1 = 1 = 1^2$, $t_8 = 36 = 6^2$, and $t_{49} = 1225 = 35^2$. What is the sum of the digits of the fourth smallest triangular number that is also a perfect square? | $\emph{triangular number}$ (์ผ๊ฐ์)๋ ์ด๋ค ์์ ์ ์ $n$์ ๋ํด $t_n = 1+2+3+\cdots+n$ ํํ๋ก ํํ๋ ์ ์๋ ์์ ์ ์์ด๋ค. ์์ ์ ๊ณฑ์์ด๊ธฐ๋ ํ ๊ฐ์ฅ ์์ ์ธ ์ผ๊ฐ์๋
$t_1 = 1 = 1^2$, $t_8 = 36 = 6^2$, ๊ทธ๋ฆฌ๊ณ $t_{49} = 1225 = 35^2$์ด๋ค. ์์ ์ ๊ณฑ์์ด๊ธฐ๋ ํ ๋ค ๋ฒ์งธ๋ก ์์ ์ผ๊ฐ์์ ๊ฐ ์๋ฆฟ์์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 18 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_16 |
8 | Suppose $a$ is a real number such that the equation \[a\cdot(\sin{x}+\sin{(2x)}) = \sin{(3x)}\]
has more than one solution in the interval $(0, \pi)$. The set of all such $a$ that can be written
in the form \[(p,q) \cup (q,r),\]
where $p, q,$ and $r$ are real numbers with $p < q< r$. What is $p+q+r$? | ๊ตฌ๊ฐ $(0, \pi)$์์ ๋ฐฉ์ ์ \[a\cdot(\sin{x}+\sin{(2x)}) = \sin{(3x)}\]์ด ๋ ๊ฐ ์ด์์ ํด๋ฅผ ๊ฐ๋๋ก ํ๋ ์ค์ $a$๊ฐ ์๋ค๊ณ ๊ฐ์ ํ์. ์ด๋ฌํ ๋ชจ๋ $a$์ ์งํฉ์ $p < q < r$์ธ ์ค์ $p, q, r$์ ๋ํด \[(p,q) \cup (q,r)\] ํํ๋ก ๋ํ๋ผ ์ ์๋ค. $p+q+r$์ ์ผ๋ง์ธ๊ฐ? | -4 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_17 |
9 | Let $T_k$ be the transformation of the coordinate plane that first rotates the plane $k$ degrees counterclockwise around the origin and then reflects the plane across the $y$-axis. What is the least positive
integer $n$ such that performing the sequence of transformations $T_1, T_2, T_3, \cdots, T_n$ returns the point $(1,0)$ back to itself? | ์ขํ ํ๋ฉด์ ์์ ์ ์ค์ฌ์ผ๋ก ๋ฐ์๊ณ ๋ฐฉํฅ์ผ๋ก $k$๋ ํ์ ์ํจ ๋ค์ $y$์ถ์ ๋ํด ๋์นญ ์ด๋์ํค๋ ๋ณํ์ $T_k$๋ผ๊ณ ํ์. ๋ณํ $T_1, T_2, T_3, \cdots, T_n$์ ์์ฐจ์ ์ผ๋ก ์ํํ์ ๋ ์ $(1,0)$์ด ๋ค์ ์๊ธฐ ์์ ์ผ๋ก ๋์์ค๋ ๊ฐ์ฅ ์์ ์์ ์ ์ $n$์ ์ผ๋ง์ธ๊ฐ? | 359 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_18 |
10 | Suppose that $13$ cards numbered $1, 2, 3, \ldots, 13$ are arranged in a row. The task is to pick them up in numerically increasing order, working repeatedly from left to right. In the example below, cards $1, 2, 3$ are picked up on the first pass, $4$ and $5$ on the second pass, $6$ on the third pass, $7, 8, 9, 10$ on the fourth pass, and $11, 12, 13$ on the fifth pass. For how many of the $13!$ possible orderings of the cards will the $13$ cards be picked up in exactly two passes? | $1$๋ถํฐ $13$๊น์ง ๋ฒํธ๊ฐ ๋งค๊ฒจ์ง $13$์ฅ์ ์นด๋๊ฐ ํ ์ค๋ก ๋ฐฐ์ด๋์ด ์๋ค. ์ผ์ชฝ์์ ์ค๋ฅธ์ชฝ์ผ๋ก ๋ฐ๋ณต์ ์ผ๋ก ์์
ํ๋ฉด์ ์ซ์๊ฐ ์ฆ๊ฐํ๋ ์์๋๋ก ์นด๋๋ฅผ ์ง์ด ์ฌ๋ฆฌ๋ ๊ฒ์ด ๋ชฉํ์ด๋ค. ์๋ ์์์ ์นด๋ $1, 2, 3$์ ์ฒซ ๋ฒ์งธ ํจ์ค์์, $4$์ $5$๋ ๋ ๋ฒ์งธ ํจ์ค์์, $6$์ ์ธ ๋ฒ์งธ ํจ์ค์์, $7, 8, 9, 10$์ ๋ค ๋ฒ์งธ ํจ์ค์์, $11, 12, 13$์ ๋ค์ฏ ๋ฒ์งธ ํจ์ค์์ ์ง์ด ์ฌ๋ฆฐ๋ค. $13!$๊ฐ์ ๊ฐ๋ฅํ ์นด๋ ์์ ์ค ์ ํํ ๋ ๋ฒ์ ํจ์ค๋ก $13$์ฅ์ ์นด๋๋ฅผ ๋ชจ๋ ์ง์ด ์ฌ๋ฆด ์ ์๋ ๊ฒฝ์ฐ์ ์๋ ์ผ๋ง์ธ๊ฐ? | 8,178 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_19 |
11 | The sum of three numbers is $96.$ The first number is $6$ times the third number, and the third number is $40$ less than the second number. What is the absolute value of the difference between the first and second numbers? | ์ธ ์์ ํฉ์ $96$์ด๋ค. ์ฒซ ๋ฒ์งธ ์๋ ์ธ ๋ฒ์งธ ์์ $6$๋ฐฐ์ด๊ณ , ์ธ ๋ฒ์งธ ์๋ ๋ ๋ฒ์งธ ์๋ณด๋ค $40$ ์๋ค. ์ฒซ ๋ฒ์งธ ์์ ๋ ๋ฒ์งธ ์์ ์ฐจ์ด์ ์ ๋๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 5 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_2 |
12 | Isosceles trapezoid $ABCD$ has parallel sides $\overline{AD}$ and $\overline{BC},$ with $BC < AD$ and $AB = CD.$ There is a point $P$ in the plane such that $PA=1, PB=2, PC=3,$ and $PD=4.$ Let $\frac{r}{s}=frac{BC}{AD}$ is irreducible fraction, what is the value of $r+s$? | ๋ฑ๋ณ์ฌ๋ค๋ฆฌ๊ผด $ABCD$๋ ํํํ ๋ณ $\overline{AD}$์ $\overline{BC}$๋ฅผ ๊ฐ์ง๊ณ ์์ผ๋ฉฐ, $BC < AD$์ด๊ณ $AB = CD$์ด๋ค. ํ๋ฉด์ $PA=1, PB=2, PC=3,$ ๊ทธ๋ฆฌ๊ณ $PD=4$๋ฅผ ๋ง์กฑํ๋ ์ $P$๊ฐ ์๋ค. $\frac{r}{s}=frac{BC}{AD}$๊ฐ ๊ธฐ์ฝ๋ถ์์ผ ๋, $r+s$์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 4 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_20 |
14 | Let $c$ be a real number, and let $z_1$ and $z_2$ be the two complex numbers satisfying the equation
$z^2 - cz + 10 = 0$. Points $z_1$, $z_2$, $\frac{1}{z_1}$, and $\frac{1}{z_2}$ are the vertices of (convex) quadrilateral $\mathcal{Q}$ in the complex plane. When the area of $\mathcal{Q}$ obtains its maximum possible value, let $c=\sqrt{m}$. what is the value of m | $c$๋ฅผ ์ค์๋ผ๊ณ ํ๊ณ , $z_1$๊ณผ $z_2$๋ฅผ ๋ฐฉ์ ์ $z^2 - cz + 10 = 0$์ ๋ง์กฑํ๋ ๋ ๋ณต์์๋ผ๊ณ ํ์. ์ $z_1$, $z_2$, $\frac{1}{z_1}$, ๊ทธ๋ฆฌ๊ณ $\frac{1}{z_2}$๋ ๋ณต์ํ๋ฉด์์ (๋ณผ๋ก) ์ฌ๊ฐํ $\mathcal{Q}$์ ๊ผญ์ง์ ์ด๋ค. $\mathcal{Q}$์ ๋์ด๊ฐ ์ต๋๊ฐ์ ๊ฐ์ง ๋, $c=\sqrt{m}$์ด๋ผ๊ณ ํ์. m์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 20 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_22 |
15 | Let $h_n$ and $k_n$ be the unique relatively prime positive integers such that \[\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{n}=\frac{h_n}{k_n}.\] Let $L_n$ denote the least common multiple of the numbers $1, 2, 3, \ldots, n$. For how many integers with $1\le{n}\le{22}$ is $k_n<L_n$? | $h_n$๊ณผ $k_n$์ \[\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{n}=\frac{h_n}{k_n}.\] ์ ๋ง์กฑํ๋ ์ ์ผํ ์๋ก์์ธ ์์ ์ ์๋ผ๊ณ ํ์. $L_n$์ $1, 2, 3, \ldots, n$์ ์ต์๊ณต๋ฐฐ์๋ผ๊ณ ํ์. $1\le{n}\le{22}$์ธ ์ ์ $n$ ์ค $k_n<L_n$์ ๋ง์กฑํ๋ $n$์ ๊ฐ์๋ ์ผ๋ง์ธ๊ฐ? | 8 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_23 |
16 | How many strings of length $5$ formed from the digits $0$, $1$, $2$, $3$, $4$ are there such that for each $j \in \{1,2,3,4\}$, at least $j$ of the digits are less than $j$? (For example, $02214$ satisfies this condition
because it contains at least $1$ digit less than $1$, at least $2$ digits less than $2$, at least $3$ digits less
than $3$, and at least $4$ digits less than $4$. The string $23404$ does not satisfy the condition because it
does not contain at least $2$ digits less than $2$.) | ์ซ์ $0$, $1$, $2$, $3$, $4$๋ก ์ด๋ฃจ์ด์ง ๊ธธ์ด๊ฐ $5$์ธ ๋ฌธ์์ด ์ค ๊ฐ $j \in \{1,2,3,4\}$์ ๋ํด $j$๋ณด๋ค ์์ ์ซ์๊ฐ ์ ์ด๋ $j$๊ฐ ์ด์ ์๋ ๋ฌธ์์ด์ ๋ช ๊ฐ์ธ๊ฐ? (์๋ฅผ ๋ค์ด, $02214$๋ $1$๋ณด๋ค ์์ ์ซ์๊ฐ ์ ์ด๋ $1$๊ฐ, $2$๋ณด๋ค ์์ ์ซ์๊ฐ ์ ์ด๋ $2$๊ฐ, $3$๋ณด๋ค ์์ ์ซ์๊ฐ ์ ์ด๋ $3$๊ฐ, $4$๋ณด๋ค ์์ ์ซ์๊ฐ ์ ์ด๋ $4$๊ฐ ์์ผ๋ฏ๋ก ์ด ์กฐ๊ฑด์ ๋ง์กฑํ๋ค. ๋ฌธ์์ด $23404$๋ $2$๋ณด๋ค ์์ ์ซ์๊ฐ ์ ์ด๋ $2$๊ฐ ์์ผ๋ฏ๋ก ์กฐ๊ฑด์ ๋ง์กฑํ์ง ์๋๋ค.) | 1,296 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_24 |
17 | A circle with integer radius $r$ is centered at $(r, r)$. Distinct line segments of length $c_i$ connect points $(0, a_i)$ to $(b_i, 0)$ for $1 \le i \le 14$ and are tangent to the circle, where $a_i$, $b_i$, and $c_i$ are all positive integers and $c_1 \le c_2 \le \cdots \le c_{14}$. What is the ratio $\frac{c_{14}}{c_1}$ for the least possible value of $r$? | ์ ์ ๋ฐ์ง๋ฆ $r$์ ๊ฐ๋ ์์ ์ค์ฌ์ด $(r, r)$์ ์๋ค. ๊ธธ์ด๊ฐ $c_i$์ธ ์๋ก ๋ค๋ฅธ ์ ๋ถ๋ค์ด ์ $(0, a_i)$์์ $(b_i, 0)$๊น์ง ์ฐ๊ฒฐ๋์ด ์์ผ๋ฉฐ ($1 \le i \le 14$), ์ด ์ ๋ถ๋ค์ ์์ ์ ํฉ๋๋ค. ์ฌ๊ธฐ์ $a_i$, $b_i$, $c_i$๋ ๋ชจ๋ ์์ ์ ์์ด๊ณ $c_1 \le c_2 \le \cdots \le c_{14}$์
๋๋ค. $r$์ ์ต์๊ฐ์ ๋ํด $\frac{c_{14}}{c_1}$์ ๋น์จ์ ์ผ๋ง์ธ๊ฐ? | 17 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_25 |
19 | The least common multiple of a positive integer $n$ and $18$ is $180$, and the greatest common divisor of $n$ and $45$ is $15$. What is the sum of the digits of $n$? | ์์ ์ ์ $n$๊ณผ $18$์ ์ต์๊ณต๋ฐฐ์๋ $180$์ด๊ณ , $n$๊ณผ $45$์ ์ต๋๊ณต์ฝ์๋ $15$์ด๋ค. $n$์ ๊ฐ ์๋ฆฟ์์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 6 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_4 |
20 | The $\textit{taxicab distance}$ between points $(x_1, y_1)$ and $(x_2, y_2)$ in the coordinate plane is given by \[|x_1 - x_2| + |y_1 - y_2|.\]
For how many points $P$ with integer coordinates is the taxicab distance between $P$ and the origin less than or equal to $20$? | ์ขํ ํ๋ฉด์์ ์ $(x_1, y_1)$๊ณผ $(x_2, y_2)$ ์ฌ์ด์ $\textit{taxicab distance}$ (ํ์ ๊ฑฐ๋ฆฌ)๋ ๋ค์๊ณผ ๊ฐ์ด ์ฃผ์ด์ง๋ค. \[|x_1 - x_2| + |y_1 - y_2|.\]
์ ์ ์ขํ๋ฅผ ๊ฐ๋ ์ $P$ ์ค ์์ ๊ณผ์ ํ์ ๊ฑฐ๋ฆฌ๊ฐ $20$ ์ดํ์ธ ์ ์ ๋ช ๊ฐ์ธ๊ฐ? | 841 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_5 |
21 | A data set consists of $6$ (not distinct) positive integers: $1$, $7$, $5$, $2$, $5$, and $X$. The average (arithmetic mean) of the $6$ numbers equals a value in the data set. What is the sum of all possible values of $X$? | ๋ฐ์ดํฐ์ธํธ๋ $6$๊ฐ์ (์๋ก ๋ค๋ฅด์ง ์์ ์ ์๋) ์์ ์ ์๋ก ๊ตฌ์ฑ๋๋ค: $1$, $7$, $5$, $2$, $5$, $X$. $6$๊ฐ ์ซ์์ ํ๊ท (์ฐ์ ํ๊ท )์ ๋ฐ์ดํฐ ์ธํธ์ ์๋ ๊ฐ๊ณผ ๊ฐ์ต๋๋ค. $X$์ ๊ฐ๋ฅํ ๋ชจ๋ ๊ฐ์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 36 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_6 |
23 | The infinite product
\[\sqrt[3]{10} \cdot \sqrt[3]{\sqrt[3]{10}} \cdot \sqrt[3]{\sqrt[3]{\sqrt[3]{10}}} \cdots\]
evaluates to a real number $\sqrt{m}$. What is the value of m? | ๋ฌดํ ๊ณฑ
\[\sqrt[3]{10} \cdot \sqrt[3]{\sqrt[3]{10}} \cdot \sqrt[3]{\sqrt[3]{\sqrt[3]{10}}} \cdots\]
์ ์ค์ $\sqrt{m}$์ผ๋ก ์๋ ดํ๋ค. $m$์ ๊ฐ์ ๋ฌด์์ธ๊ฐ? | 10 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_8 |
24 | On Halloween $31$ children walked into the principal's office asking for candy. They can be classified into three types: Some always lie; some always tell the truth; and some alternately lie and tell the truth. The alternaters arbitrarily choose their first response, either a lie or the truth, but each subsequent statement has the opposite truth value from its predecessor. The principal asked everyone the same three questions in this order. "Are you a truth-teller?" The principal gave a piece of candy to each of the $22$ children who answered yes. "Are you an alternater?" The principal gave a piece of candy to each of the $15$ children who answered yes. "Are you a liar?" The principal gave a piece of candy to each of the $9$ children who answered yes. How many pieces of candy in all did the principal give to the children who always tell the truth? | ํ ๋ก์์ 31๋ช
์ ์์ด๋ค์ด ์ฌํ์ ๋ฌ๋ผ๊ณ ๊ต์ฅ ์ ์๋ ์ฌ๋ฌด์ค์ ๋ค์ด๊ฐ๋ค. ์์ด๋ค์ ์ธ ๊ฐ์ง ์ ํ์ผ๋ก ๋ถ๋ฅํ ์ ์๋ค: ํญ์ ๊ฑฐ์ง๋ง์ ํ๋ ์์ด๋ค, ํญ์ ์ง์ค์ ๋งํ๋ ์์ด๋ค, ๊ทธ๋ฆฌ๊ณ ๊ฑฐ์ง๋ง๊ณผ ์ง์ค์ ๋ฒ๊ฐ์ ๋งํ๋ ์์ด๋ค. ๋ฒ๊ฐ์ ๋งํ๋ ์์ด๋ค์ ์ฒซ ๋ฒ์งธ ๋๋ต์ ๊ฑฐ์ง๋ง์ด๋ ์ง์ค ์ค์์ ์์๋ก ์ ํํ์ง๋ง, ๊ทธ ์ดํ์ ๊ฐ ์ง์ ์ ์ด์ ์ง์ ๊ณผ ๋ฐ๋๋๋ ์ง๋ฆฌ ๊ฐ์ ๊ฐ๋๋ค. ๊ต์ฅ ์ ์๋์ ๋ชจ๋ ์์ด๋ค์๊ฒ ๋ค์ ์ธ ๊ฐ์ง ์ง๋ฌธ์ ๊ฐ์ ์์๋ก ํ๋ค. "๋๋ ์ง์ค์ ๋งํ๋ ์์ด๋?" ๊ต์ฅ ์ ์๋์ "์"๋ผ๊ณ ๋๋ตํ 22๋ช
์ ์์ด๋ค ๊ฐ๊ฐ์๊ฒ ์ฌํ์ ํ ๊ฐ์ฉ ์ฃผ์๋ค. "๋๋ ๋ฒ๊ฐ์ ๋งํ๋ ์์ด๋?" ๊ต์ฅ ์ ์๋์ "์"๋ผ๊ณ ๋๋ตํ 15๋ช
์ ์์ด๋ค ๊ฐ๊ฐ์๊ฒ ์ฌํ์ ํ ๊ฐ์ฉ ์ฃผ์๋ค. "๋๋ ๊ฑฐ์ง๋ง์์ด๋?" ๊ต์ฅ ์ ์๋์ "์"๋ผ๊ณ ๋๋ตํ 9๋ช
์ ์์ด๋ค ๊ฐ๊ฐ์๊ฒ ์ฌํ์ ํ ๊ฐ์ฉ ์ฃผ์๋ค. ๊ต์ฅ ์ ์๋์ ํญ์ ์ง์ค์ ๋งํ๋ ์์ด๋ค์๊ฒ ์ด ๋ช ๊ฐ์ ์ฌํ์ ์ฃผ์๋๊ฐ? | 7 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_9 |
25 | Define $x\diamond y$ to be $|x-y|$ for all real numbers $x$ and $y.$ What is the value of \[((1\diamond2)\diamond3)-(1\diamond(2\diamond3))?\] | ๋ชจ๋ ์ค์ $x$์ $y$์ ๋ํด $x\diamond y$๋ฅผ $|x-y|$๋ก ์ ์ํ๋ค. \[((1\diamond2)\diamond3)-(1\diamond(2\diamond3))\]์ ๊ฐ์ ๋ฌด์์ธ๊ฐ? | 2 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_1 |
27 | Let $f(n) = \left( \frac{-1+i\sqrt{3}}{2} \right)^n + \left( \frac{-1-i\sqrt{3}}{2} \right)^n$, where $i = \sqrt{-1}$. What is $f(2022)$? | $i = \sqrt{-1}$์ผ ๋, $f(n) = \left( \frac{-1+i\sqrt{3}}{2} \right)^n + \left( \frac{-1-i\sqrt{3}}{2} \right)^n$์ด๋ผ๊ณ ํ์. $f(2022)$๋ ๋ฌด์์ธ๊ฐ? | 2 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_11 |
28 | Kayla rolls four fair $6$-sided dice. What is the denominator minus the numerator of the probability that at least one of the numbers Kayla rolls is greater than 4 and at least two of the numbers she rolls are greater than 2? | Kayla๋ ๋ค ๊ฐ์ ๊ณต์ ํ 6๋ฉด์ฒด ์ฃผ์ฌ์๋ฅผ ๊ตด๋ฆฐ๋ค. Kayla๊ฐ ๊ตด๋ ค์ ์ป์ ์ซ์๋ค ์ค ์ ์ด๋ ํ๋๋ 4๋ณด๋ค ํฌ๊ณ ์ ์ด๋ ๋ ๊ฐ๋ 2๋ณด๋ค ํด ํ๋ฅ ์ ๋ถ๋ชจ์์ ๋ถ์๋ฅผ ๋บ ๊ฐ์ ๋ฌด์์ธ๊ฐ? | 20 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_12 |
29 | The diagram below shows a rectangle with side lengths $4$ and $8$ and a square with side length $5$. Three vertices of the square lie on three different sides of the rectangle, as shown. What is the numerator of the simplest fraction that represents the area of the region inside both the square and the rectangle? | ์๋ ๊ทธ๋ฆผ์ ๊ฐ๋ก ๊ธธ์ด๊ฐ $4$์ด๊ณ ์ธ๋ก ๊ธธ์ด๊ฐ $8$์ธ ์ง์ฌ๊ฐํ๊ณผ ํ ๋ณ์ ๊ธธ์ด๊ฐ $5$์ธ ์ ์ฌ๊ฐํ์ ๋ณด์ฌ์ค๋ค. ๊ทธ๋ฆผ๊ณผ ๊ฐ์ด ์ ์ฌ๊ฐํ์ ์ธ ๊ผญ์ง์ ์ ์ง์ฌ๊ฐํ์ ์ธ ๋ณ ์์ ์๋ค. ์ง์ฌ๊ฐํ๊ณผ ์ ์ฌ๊ฐํ ๋ชจ๋์ ์ํ๋ ์์ญ์ ๋์ด๋ฅผ ๋ํ๋ด๋ ๊ธฐ์ฝ๋ถ์์ ๋ถ์๋ ๋ฌด์์ธ๊ฐ?
[asy] size(5cm); filldraw((4,0)--(8,3)--(8-3/4,4)--(1,4)--cycle,mediumgray); draw((0,0)--(8,0)--(8,4)--(0,4)--cycle,linewidth(1.1)); draw((1,0)--(1,4)--(4,0)--(8,3)--(5,7)--(1,4),linewidth(1.1)); label("$4$", (8,2), E); label("$8$", (4,0), S); label("$5$", (3,11/2), NW); draw((1,.35)--(1.35,.35)--(1.35,0),linewidth(1.1)); [/asy] | 5 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_13 |
30 | The graph of $y=x^2+2x-15$ intersects the $x$-axis at points $A$ and $C$ and the $y$-axis at point $B$. What is the numerator of the simplest fraction that represents $\tan(\angle ABC)$? | $y=x^2+2x-15$์ ๊ทธ๋ํ๋ $x$-์ถ๊ณผ ์ $A$์ $C$์์ ๊ต์ฐจํ๊ณ $y$-์ถ๊ณผ ์ $B$์์ ๊ต์ฐจํ๋ค. $\tan(\angle ABC)$๋ฅผ ๋ํ๋ด๋ ๊ธฐ์ฝ๋ถ์์ ๋ถ์๋ ๋ฌด์์ธ๊ฐ? | 4 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_14 |
33 | How many $4 \times 4$ arrays whose entries are $0$s and $1$s are there such that the row sums (the sum of the entries in each row) are $1, 2, 3,$ and $4,$ in some order, and the column sums (the sum of the entries in each column) are also $1, 2, 3,$ and $4,$ in some order? Output the remainder when the answer is divided by 100.
For example, the array
\[\left[ \begin{array}{cccc} 1 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 \\ \end{array} \right]\]
satisfies the condition. | ๊ฐ ํญ๋ชฉ์ด $0$ ๋๋ $1$์ธ $4 \times 4$ ๋ฐฐ์ด ์ค์์ ํ ํฉ(๊ฐ ํ์ ํญ๋ชฉ ํฉ)์ด ์ด๋ค ์์๋ก $1, 2, 3, 4$์ด๊ณ ์ด ํฉ(๊ฐ ์ด์ ํญ๋ชฉ ํฉ)๋ ์ด๋ค ์์๋ก $1, 2, 3, 4$์ธ ๋ฐฐ์ด์ ๋ช ๊ฐ์ธ๊ฐ? ๋ต์ 100์ผ๋ก ๋๋ ๋๋จธ์ง๋ฅผ ์ถ๋ ฅํ์์ค.
์๋ฅผ ๋ค์ด, ๋ฐฐ์ด
\[\left[ \begin{array}{cccc} 1 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 \\ \end{array} \right]\]
์ ์กฐ๊ฑด์ ๋ง์กฑํ๋ค. | 76 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_17 |
34 | Each square in a $5 \times 5$ grid is either filled or empty, and has up to eight adjacent neighboring squares, where neighboring squares share either a side or a corner. The grid is transformed by the following rules:
Any filled square with two or three filled neighbors remains filled.
Any empty square with exactly three filled neighbors becomes a filled square.
All other squares remain empty or become empty.
A sample transformation is shown in the figure below.
Suppose the $5 \times 5$ grid has a border of empty squares surrounding a $3 \times 3$ subgrid. How many initial configurations will lead to a transformed grid consisting of a single filled square in the center after a single transformation? (Rotations and reflections of the same configuration are considered different.) | $5 \times 5$ ๊ฒฉ์์ ๊ฐ ์ ์ฌ๊ฐํ์ ์ฑ์์ ธ ์๊ฑฐ๋ ๋น์ด ์์ผ๋ฉฐ, ์ต๋ 8๊ฐ์ ์ธ์ ํ ์ด์ ์ ์ฌ๊ฐํ์ ๊ฐ์ง๋ค. ์ฌ๊ธฐ์ ์ด์ ์ ์ฌ๊ฐํ์ ๋ณ ๋๋ ๋ชจ์๋ฆฌ๋ฅผ ๊ณต์ ํ๋ค. ๊ฒฉ์๋ ๋ค์ ๊ท์น์ ๋ฐ๋ผ ๋ณํ๋๋ค.
์ฑ์์ง ์ด์์ด 2๊ฐ ๋๋ 3๊ฐ์ธ ์ฑ์์ง ์ ์ฌ๊ฐํ์ ์ฑ์์ง ์ํ๋ก ์ ์ง๋๋ค.
์ฑ์์ง ์ด์์ด ์ ํํ 3๊ฐ์ธ ๋น ์ ์ฌ๊ฐํ์ ์ฑ์์ง ์ ์ฌ๊ฐํ์ด ๋๋ค.
๋ค๋ฅธ ๋ชจ๋ ์ ์ฌ๊ฐํ์ ๊ณ์ ๋น์ด ์๊ฑฐ๋ ๋น์ด ์๊ฒ ๋๋ค.
์ํ ๋ณํ์ ์๋ ๊ทธ๋ฆผ์ ๋์ ์๋ค.
[asy] import geometry; unitsize(0.6cm); void ds(pair x) { filldraw(x -- (1,0) + x -- (1,1) + x -- (0,1)+x -- cycle,mediumgray,invisible); } ds((1,1)); ds((2,1)); ds((3,1)); ds((1,3)); for (int i = 0; i <= 5; ++i) { draw((0,i)--(5,i)); draw((i,0)--(i,5)); } label("Initial", (2.5,-1)); draw((6,2.5)--(8,2.5),Arrow); ds((10,2)); ds((11,1)); ds((11,0)); for (int i = 0; i <= 5; ++i) { draw((9,i)--(14,i)); draw((i+9,0)--(i+9,5)); } label("Transformed", (11.5,-1)); [/asy]
$5 \times 5$ ๊ฒฉ์์ $3 \times 3$ ํ์ ๊ฒฉ์๋ฅผ ๋๋ฌ์ผ ๋น ์ ์ฌ๊ฐํ ํ
๋๋ฆฌ๊ฐ ์๋ค๊ณ ๊ฐ์ ํ์. ๋จ์ผ ๋ณํ ํ ์ค์์ ์ฑ์์ง ์ ์ฌ๊ฐํ์ด ํ๋๋ง ์๋ ๋ณํ๋ ๊ฒฉ์๋ก ์ด์ด์ง๋ ์ด๊ธฐ ๊ตฌ์ฑ์ ๋ช ๊ฐ์ธ๊ฐ? (๋์ผํ ๊ตฌ์ฑ์ ํ์ ๋ฐ ๋ฐ์ฌ๋ ๋ค๋ฅด๊ฒ ๊ฐ์ฃผ๋๋ค.) | 22 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_18 |
35 | In $\triangle{ABC}$ medians $\overline{AD}$ and $\overline{BE}$ intersect at $G$ and $\triangle{AGE}$ is equilateral. Then $\cos(C)$ can be written as $\frac{m\sqrt p}n$, where $m$ and $n$ are relatively prime positive integers and $p$ is a positive integer not divisible by the square of any prime. What is $m+n+p?$ | $\triangle{ABC}$์์ ์ค์ $\overline{AD}$์ $\overline{BE}$๋ $G$์์ ๊ต์ฐจํ๊ณ $\triangle{AGE}$๋ ์ ์ผ๊ฐํ์ด๋ค. ๊ทธ๋ฌ๋ฉด $\cos(C)$๋ $\frac{m\sqrt p}n$์ผ๋ก ์ธ ์ ์๋ค. ์ฌ๊ธฐ์ $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๊ณ $p$๋ ์ด๋ค ์์์ ์ ๊ณฑ์ผ๋ก๋ ๋๋์ด์ง์ง ์๋ ์์ ์ ์์ด๋ค. $m+n+p$๋ ๋ฌด์์ธ๊ฐ? | 44 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_19 |
36 | In rhombus $ABCD$, point $P$ lies on segment $\overline{AD}$ so that $\overline{BP}$ $\perp$ $\overline{AD}$, $AP = 3$, and $PD = 2$. What is the area of $ABCD$? (Note: The figure is not drawn to scale.)
| ๋ง๋ฆ๋ชจ $ABCD$์์ ์ $P$๋ ์ ๋ถ $\overline{AD}$ ์์ ์์ด $\overline{BP}$ $\perp$ $\overline{AD}$, $AP = 3$, ๊ทธ๋ฆฌ๊ณ $PD = 2$๋ฅผ ๋ง์กฑํ๋ค. $ABCD$์ ๋์ด๋ ์ผ๋ง์ธ๊ฐ? | 20 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_2 |
37 | Let $P(x)$ be a polynomial with rational coefficients such that when $P(x)$ is divided by the polynomial
$x^2 + x + 1$, the remainder is $x+2$, and when $P(x)$ is divided by the polynomial $x^2+1$, the remainder
is $2x+1$. There is a unique polynomial of least degree with these two properties. What is the sum of
the squares of the coefficients of that polynomial? | $P(x)$๋ฅผ ์ ๋ฆฌ์ ๊ณ์๋ฅผ ๊ฐ๋ ๋คํญ์์ด๋ผ๊ณ ํ์. $P(x)$๋ฅผ ๋คํญ์ $x^2 + x + 1$๋ก ๋๋๋ฉด ๋๋จธ์ง๊ฐ $x+2$์ด๊ณ , $P(x)$๋ฅผ ๋คํญ์ $x^2+1$๋ก ๋๋๋ฉด ๋๋จธ์ง๊ฐ $2x+1$์ด๋ค. ์ด ๋ ๊ฐ์ง ์ฑ์ง์ ๋ง์กฑํ๋ ์ต์ ์ฐจ์์ ๋คํญ์์ ์ ์ผํ๊ฒ ์กด์ฌํ๋ค. ๊ทธ ๋คํญ์์ ๊ณ์๋ค์ ์ ๊ณฑ์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 23 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_20 |
38 | Let $S$ be the set of circles in the coordinate plane that are tangent to each of the three circles with equations $x^{2}+y^{2}=4$, $x^{2}+y^{2}=64$, and $(x-5)^{2}+y^{2}=3$. What is the sum of the areas of all circles in $S$?Output the remainder when the answer is divided by 100.
| $S$๋ฅผ ์ขํํ๋ฉด์์ ๋ฐฉ์ ์ $x^{2}+y^{2}=4$, $x^{2}+y^{2}=64$, ๊ทธ๋ฆฌ๊ณ $(x-5)^{2}+y^{2}=3$์ ๊ฐ๋ ์ธ ์์ ๊ฐ๊ฐ ์ ํ๋ ์๋ค์ ์งํฉ์ด๋ผ๊ณ ํ์. $S$์ ์๋ ๋ชจ๋ ์๋ค์ ๋์ด์ ํฉ์ ์ผ๋ง์ธ๊ฐ? ๋ต์ 100์ผ๋ก ๋๋ ๋๋จธ์ง๋ฅผ ์ถ๋ ฅํ์์ค. | 36 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_21 |
39 | Ant Amelia starts on the number line at $0$ and crawls in the following manner. For $n=1,2,3,$ Amelia chooses a time duration $t_n$ and an increment $x_n$ independently and uniformly at random from the interval $(0,1).$ During the $n$th step of the process, Amelia moves $x_n$ units in the positive direction, using up $t_n$ minutes. If the total elapsed time has exceeded $1$ minute during the $n$th step, she stops at the end of that step; otherwise, she continues with the next step, taking at most $3$ steps in all. What is the denominator plus the numerator of thethe probability that Ameliaโs position when she stops will be greater than $1$? | ๊ฐ๋ฏธ Amelia๋ ์์ง์ ์์ $0$์์ ์์ํ์ฌ ๋ค์๊ณผ ๊ฐ์ ๋ฐฉ์์ผ๋ก ๊ธฐ์ด๊ฐ๋ค. $n=1,2,3,$์ ๋ํด Amelia๋ ์๊ฐ ๊ฐ๊ฒฉ $t_n$๊ณผ ์ฆ๋ถ $x_n$์ ๊ตฌ๊ฐ $(0,1)$์์ ๋
๋ฆฝ์ ์ด๊ณ ๊ท ์ผํ๊ฒ ๋ฌด์์๋ก ์ ํํ๋ค. ๊ณผ์ ์ $n$๋ฒ์งธ ๋จ๊ณ ๋์ Amelia๋ $t_n$๋ถ์ ์ฌ์ฉํ์ฌ ์์ ๋ฐฉํฅ์ผ๋ก $x_n$๋งํผ ์ด๋ํ๋ค. $n$๋ฒ์งธ ๋จ๊ณ ๋์ ์ด ๊ฒฝ๊ณผ ์๊ฐ์ด $1$๋ถ์ ์ด๊ณผํ๋ฉด ํด๋น ๋จ๊ณ์ ๋์์ ๋ฉ์ถ๋ค. ๊ทธ๋ ์ง ์์ผ๋ฉด ์ต๋ $3$๋จ๊ณ๊น์ง ๋ค์ ๋จ๊ณ๋ฅผ ๊ณ์ํ๋ค. Amelia๊ฐ ๋ฉ์ถ ๋์ ์์น๊ฐ $1$๋ณด๋ค ํด ํ๋ฅ ์ ๋ถ๋ชจ์ ๋ถ์์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 5 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_22 |
40 | Let $x_0,x_1,x_2,\dotsc$ be a sequence of numbers, where each $x_k$ is either $0$ or $1$. For each positive integer $n$, define
\[S_n = \sum_{k=0}^{n-1} x_k 2^k\]
Suppose $7S_n \equiv 1 \pmod{2^n}$ for all $n \geq 1$. What is the value of the sum
\[x_{2019} + 2x_{2020} + 4x_{2021} + 8x_{2022}?\] | $x_0,x_1,x_2,\dotsc$๋ฅผ ๊ฐ $x_k$๊ฐ $0$ ๋๋ $1$์ธ ์์ด์ด๋ผ๊ณ ํ์. ๊ฐ ์์ ์ ์ $n$์ ๋ํด
\[S_n = \sum_{k=0}^{n-1} x_k 2^k\]
๋ผ๊ณ ์ ์ํ๋ค. ๋ชจ๋ $n \geq 1$์ ๋ํด $7S_n \equiv 1 \pmod{2^n}$์ด๋ผ๊ณ ๊ฐ์ ํ์. ํฉ
\[x_{2019} + 2x_{2020} + 4x_{2021} + 8x_{2022}\]
์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 6 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_23 |
41 | The figure below depicts a regular $7$-gon inscribed in a unit circle.
[asy] import geometry; unitsize(3cm); draw(circle((0,0),1),linewidth(1.5)); for (int i = 0; i < 7; ++i) { for (int j = 0; j < i; ++j) { draw(dir(i * 360/7) -- dir(j * 360/7),linewidth(1.5)); } } for(int i = 0; i < 7; ++i) { dot(dir(i * 360/7),5+black); } [/asy]
What is the sum of the $4$th powers of the lengths of all $21$ of its edges and diagonals?Output the remainder when the answer is divided by 100.
| ์๋ ๊ทธ๋ฆผ์ ๋จ์ ์์ ๋ด์ ํ๋ ์ $7$๊ฐํ์ ๋ํ๋ธ๋ค.
[asy] import geometry; unitsize(3cm); draw(circle((0,0),1),linewidth(1.5)); for (int i = 0; i < 7; ++i) { for (int j = 0; j < i; ++j) { draw(dir(i * 360/7) -- dir(j * 360/7),linewidth(1.5)); } } for(int i = 0; i < 7; ++i) { dot(dir(i * 360/7),5+black); } [/asy]
๋ชจ๋ 21๊ฐ์ ๋ณ๊ณผ ๋๊ฐ์ ๊ธธ์ด์ 4์ ๊ณฑ์ ํฉ์ ์ผ๋ง์ธ๊ฐ? ๋ต์ 100์ผ๋ก ๋๋ ๋๋จธ์ง๋ฅผ ์ถ๋ ฅํ์์ค. | 47 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_24 |
42 | Four regular hexagons surround a square with side length 1, each one sharing an edge with the square,
as shown in the figure below. The area of the resulting 12-sided outer nonconvex polygon can be
written as $m \sqrt{n} + p$, where $m$, $n$, and $p$ are integers and $n$ is not divisible by the square of any prime.
What is the absolute value of $m+n+p$?
[asy] import geometry; unitsize(3cm); draw((0,0) -- (1,0) -- (1,1) -- (0,1) -- cycle); draw(shift((1/2,1-sqrt(3)/2))*polygon(6)); draw(shift((1/2,sqrt(3)/2))*polygon(6)); draw(shift((sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw(shift((1-sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw((0,1-sqrt(3))--(1,1-sqrt(3))--(3-sqrt(3),sqrt(3)-2)--(sqrt(3),0)--(sqrt(3),1)--(3-sqrt(3),3-sqrt(3))--(1,sqrt(3))--(0,sqrt(3))--(sqrt(3)-2,3-sqrt(3))--(1-sqrt(3),1)--(1-sqrt(3),0)--(sqrt(3)-2,sqrt(3)-2)--cycle,linewidth(2)); [/asy] | ์๋ ๊ทธ๋ฆผ๊ณผ ๊ฐ์ด ๋ค ๊ฐ์ ์ ์ก๊ฐํ์ด ํ ๋ณ์ ๊ธธ์ด๊ฐ 1์ธ ์ ์ฌ๊ฐํ์ ๋๋ฌ์ธ๊ณ ์์ผ๋ฉฐ, ๊ฐ ์ก๊ฐํ์ ์ ์ฌ๊ฐํ๊ณผ ํ ๋ณ์ ๊ณต์ ํ๋ค. ๊ฒฐ๊ณผ์ ์ผ๋ก ์์ฑ๋ 12๊ฐํ์ ์ค๋ชฉ ๋ค๊ฐํ์ ๋์ด๋ $m \sqrt{n} + p$๋ก ์ธ ์ ์๋ค. ์ฌ๊ธฐ์ $m$, $n$, $p$๋ ์ ์์ด๊ณ $n$์ ์ด๋ค ์์์ ์ ๊ณฑ์ผ๋ก๋ ๋๋์ด์ง์ง ์๋๋ค. $m+n+p$์ ์ ๋๊ฐ์ ์ผ๋ง์ธ๊ฐ?
[asy] import geometry; unitsize(3cm); draw((0,0) -- (1,0) -- (1,1) -- (0,1) -- cycle); draw(shift((1/2,1-sqrt(3)/2))*polygon(6)); draw(shift((1/2,sqrt(3)/2))*polygon(6)); draw(shift((sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw(shift((1-sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw((0,1-sqrt(3))--(1,1-sqrt(3))--(3-sqrt(3),sqrt(3)-2)--(sqrt(3),0)--(sqrt(3),1)--(3-sqrt(3),3-sqrt(3))--(1,sqrt(3))--(0,sqrt(3))--(sqrt(3)-2,3-sqrt(3))--(1-sqrt(3),1)--(1-sqrt(3),0)--(sqrt(3)-2,sqrt(3)-2)--cycle,linewidth(2)); [/asy] | 4 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_25 |
43 | How many of the first ten numbers of the sequence $121, 11211, 1112111, \ldots$ are prime numbers? | ์์ด $121, 11211, 1112111, \ldots$์ ์ฒ์ 10๊ฐ ์ซ์ ์ค ์์๋ ๋ช ๊ฐ์ธ๊ฐ? | 0 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_3 |
44 | For how many values of the constant $k$ will the polynomial $x^{2}+kx+36$ have two distinct integer roots? | ๋คํญ์ $x^{2}+kx+36$์ด ๋ ๊ฐ์ ์๋ก ๋ค๋ฅธ ์ ์ ๊ทผ์ ๊ฐ๋๋ก ํ๋ ์์ $k$์ ๊ฐ์ ๋ช๊ฐ์ธ๊ฐ? | 8 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_4 |
45 | What is the sum of the x and y coordinates of the new position of the point $(-1, -2)$ after rotating $270^{\circ}$ counterclockwise about the point $(3, 1)$? | ์ $(3, 1)$์ ์ค์ฌ์ผ๋ก ์ $(-1, -2)$๋ฅผ $270^{\circ}$ ๋ฐ์๊ณ ๋ฐฉํฅ์ผ๋ก ํ์ ํ ์๋ก์ด ์ ์ ์์น์ x ๋ฐ y ์ขํ์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 5 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_5 |
46 | Consider the following $100$ sets of $10$ elements each:
\begin{align*} &\{1,2,3,\ldots,10\}, \\ &\{11,12,13,\ldots,20\},\\ &\{21,22,23,\ldots,30\},\\ &\vdots\\ &\{991,992,993,\ldots,1000\}. \end{align*}
How many of these sets contain exactly two multiples of $7$? | ๋ค์๊ณผ ๊ฐ์ 10๊ฐ์ ์์๋ฅผ ๊ฐ์ง 100๊ฐ์ ์งํฉ์ ์๊ฐํด๋ณด์์ค:
\begin{align*} &\{1,2,3,\ldots,10\}, \\ &\{11,12,13,\ldots,20\},\\ &\{21,22,23,\ldots,30\},\\ &\vdots\\ &\{991,992,993,\ldots,1000\}. \end{align*}
์ด ์งํฉ๋ค ์ค 7์ ๋ฐฐ์๋ฅผ ์ ํํ ๋ ๊ฐ ํฌํจํ๋ ์งํฉ์ ๋ช ๊ฐ์ธ๊ฐ? | 42 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_6 |
47 | Camila writes down five positive integers. The unique mode of these integers is $2$ greater than their median, and the median is $2$ greater than their arithmetic mean. What is the least possible value for the mode? | Camila๋ ๋ค์ฏ ๊ฐ์ ์์ ์ ์๋ฅผ ์ ๋๋ค. ์ด ์ ์๋ค์ ์ ์ผํ ์ต๋น๊ฐ์ ์ค์๊ฐ๋ณด๋ค 2๋งํผ ํฌ๊ณ , ์ค์๊ฐ์ ์ฐ์ ํ๊ท ๋ณด๋ค 2๋งํผ ํฌ๋ค. ์ต๋น๊ฐ์ ์ต์๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 11 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_7 |
49 | The sequence $a_0,a_1,a_2,\cdots$ is a strictly increasing arithmetic sequence of positive integers such that \[2^{a_7}=2^{27} \cdot a_7.\] What is the minimum possible value of $a_2$? | ์์ด $a_0,a_1,a_2,\cdots$๋ ์์ ์ ์๋ก ์ด๋ฃจ์ด์ง ์์ฆ๊ฐํ๋ ๋ฑ์ฐจ์์ด์ด๋ฉฐ, ๋ค์์ ๋ง์กฑํ๋ค. \[2^{a_7}=2^{27} \cdot a_7.\] $a_2$์ ์ต์๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 12 | https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_9 |
0 | Cities $A$ and $B$ are $45$ miles apart. Alicia lives in $A$ and Beth lives in $B$. Alicia bikes towards $B$ at 18 miles per hour. Leaving at the same time, Beth bikes toward $A$ at 12 miles per hour. How many miles from City $A$ will they be when they meet? | ๋์ A์ B๋ 45๋ง์ผ ๋จ์ด์ ธ ์๋ค. Alicia๋ A์ ์ด๊ณ Beth๋ B์ ์ฐ๋ค. Alicia๋ ์์ 18๋ง์ผ๋ก B๋ฅผ ํฅํด ์์ ๊ฑฐ๋ฅผ ํ๊ณ ๊ฐ๋ค. ๋์์ Beth๋ ์์ 12๋ง์ผ๋ก A๋ฅผ ํฅํด ์์ ๊ฑฐ๋ฅผ ํ๊ณ ๊ฐ๋ค. ๊ทธ๋ค์ด ๋ง๋ ๋ ๋์ A์์ ๋ช ๋ง์ผ ๋จ์ด์ ธ ์๋๊ฐ? | 27 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_1 |
1 | Positive real numbers $x$ and $y$ satisfy $y^3=x^2$ and $(y-x)^2=4y^2$. What is $x+y$? | ์์ ์ค์ $x$์ $y$๋ $y^3=x^2$๊ณผ $(y-x)^2=4y^2$์ ๋ง์กฑํ๋ค. $x+y$๋ ์ผ๋ง์ธ๊ฐ? | 36 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_10 |
2 | What is the degree measure of the acute angle formed by lines with slopes $2$ and $\frac{1}{3}$? | ๊ธฐ์ธ๊ธฐ๊ฐ $2$ ์ $\frac{1}{3}$ ์ธ ๋ ์ง์ ์ด ์ด๋ฃจ๋ ์๊ฐ์ ํฌ๊ธฐ๋ ๋ช ๋์ธ๊ฐ? | 45 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_11 |
3 | What is the value of
\[2^3 - 1^3 + 4^3 - 3^3 + 6^3 - 5^3 + \dots + 18^3 - 17^3?\] | ๋ค์ ์์ ๊ฐ์ ๋ฌด์์ธ๊ฐ?
\[2^3 - 1^3 + 4^3 - 3^3 + 6^3 - 5^3 + \dots + 18^3 - 17^3?\] | 3,159 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_12 |
4 | In a table tennis tournament every participant played every other participant exactly once. Although there were twice as many right-handed players as left-handed players, the number of games won by left-handed players was $40\%$ more than the number of games won by right-handed players. (There were no ties and no ambidextrous players.) What is the total number of games played? | ํ๊ตฌ ํ ๋๋จผํธ์์ ๋ชจ๋ ์ฐธ๊ฐ์๋ ๋ค๋ฅธ ๋ชจ๋ ์ฐธ๊ฐ์์ ์ ํํ ํ ๋ฒ์ฉ ๊ฒฝ๊ธฐ๋ฅผ ํ๋ค. ์ค๋ฅธ์์ก์ด ์ ์๊ฐ ์ผ์์ก์ด ์ ์์ ๋ ๋ฐฐ์์ง๋ง, ์ผ์์ก์ด ์ ์๊ฐ ์ด๊ธด ๊ฒฝ๊ธฐ ์๋ ์ค๋ฅธ์์ก์ด ์ ์๊ฐ ์ด๊ธด ๊ฒฝ๊ธฐ ์๋ณด๋ค $40\%$ ๋ ๋ง์๋ค. (๋ฌด์น๋ถ๋ ์์์ก์ด ์ ์๋ ์์๋ค.) ์ด ๊ฒฝ๊ธฐ ์๋ ๋ช ๊ฒฝ๊ธฐ์๋๊ฐ? | 36 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_13 |
5 | How many complex numbers satisfy the equation $z^5=\overline{z}$, where $\overline{z}$ is the conjugate of the complex number $z$? | ๋ณต์์ $z$์ ์ผค๋ ๋ณต์์๋ฅผ $\overline{z}$๋ผ๊ณ ํ ๋, ๋ฐฉ์ ์ $z^5=\overline{z}$๋ฅผ ๋ง์กฑํ๋ ๋ณต์์๋ ๋ช ๊ฐ์ธ๊ฐ? | 7 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_14 |
7 | Consider the set of complex numbers $z$ satisfying $|1+z+z^{2}|=4$. The maximum value of the imaginary part of $z$ can be written in the form $\tfrac{\sqrt{m}}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | $|1+z+z^{2}|=4$๋ฅผ ๋ง์กฑํ๋ ๋ณต์์ $z$์ ์งํฉ์ ์๊ฐํด๋ณด์. $z$์ ํ์ ๋ถ๋ถ์ ์ต๋๊ฐ์ $\tfrac{\sqrt{m}}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, ์ฌ๊ธฐ์ $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ๊ฐ์ ๋ฌด์์ธ๊ฐ? | 21 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_16 |
8 | Flora the frog starts at 0 on the number line and makes a sequence of jumps to the right. In any one jump, independent of previous jumps, Flora leaps a positive integer distance $m$ with probability $\frac{1}{2^m}$.
What is the probability that Flora will eventually land at 10? Write the answer as a simplified fraction $\frac{m}{n}$, find $m+n$ | ๊ฐ๊ตฌ๋ฆฌ Flora๋ ์์ง์ ์ 0์์ ์์ํ์ฌ ์ค๋ฅธ์ชฝ์ผ๋ก ์ ํ๋ฅผ ํ๋ค. ๊ฐ ์ ํ์์, ์ด์ ์ ํ์ ๋
๋ฆฝ์ ์ผ๋ก Flora๋ ์์ ์ ์ ๊ฑฐ๋ฆฌ $m$์ ํ๋ฅ $\frac{1}{2^m}$์ผ๋ก ์ ํํ๋ค. Flora๊ฐ ๊ฒฐ๊ตญ 10์ ๋์ฐฉํ ํ๋ฅ ์ ์ผ๋ง์ธ๊ฐ? ๋ต์ ๊ธฐ์ฝ๋ถ์ $\frac{m}{n}$์ผ๋ก ์ฐ๊ณ , $m+n$์ ๊ตฌํ์์ค. | 3 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_17 |
10 | What is the product of all solutions to the equation
\[\log_{7x}2023\cdot \log_{289x}2023=\log_{2023x}2023\] | ๋ฐฉ์ ์
\[\log_{7x}2023\cdot \log_{289x}2023=\log_{2023x}2023\]
์ ๋ชจ๋ ํด์ ๊ณฑ์ ์ผ๋ง์ธ๊ฐ? | 1 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_19 |
11 | The weight of $\frac{1}{3}$ of a large pizza together with $3 \frac{1}{2}$ cups of orange slices is the same as the weight of $\frac{3}{4}$ of a large pizza together with $\frac{1}{2}$ cup of orange slices. A cup of orange slices weighs $\frac{1}{4}$ of a pound. What is the weight, in pounds, of a large pizza? The answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m-n$? | ํฐ ํผ์ $\frac{1}{3}$์ ๋ฌด๊ฒ์ ์ค๋ ์ง ์กฐ๊ฐ $3 \frac{1}{2}$ ์ปต์ ๋ฌด๊ฒ๋ ํฐ ํผ์ $\frac{3}{4}$์ ๋ฌด๊ฒ์ ์ค๋ ์ง ์กฐ๊ฐ $\frac{1}{2}$ ์ปต์ ๋ฌด๊ฒ์ ๊ฐ๋ค. ์ค๋ ์ง ์กฐ๊ฐ ํ ์ปต์ ๋ฌด๊ฒ๋ $\frac{1}{4}$ ํ์ด๋์ด๋ค. ํฐ ํผ์์ ๋ฌด๊ฒ๋ ํ์ด๋ ๋จ์๋ก ์ผ๋ง์ธ๊ฐ? ๋ต์ $\frac{m}{n}$ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, ์ฌ๊ธฐ์ $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m-n$์ ์ผ๋ง์ธ๊ฐ? | 4 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_2 |
12 | Rows 1, 2, 3, 4, and 5 of a triangular array of integers are shown below.
1
1 1
1 3 1
1 5 5 1
1 7 11 7 1
Each row after the first row is formed by placing a 1 at each end of the row, and each interior entry is 1 greater than the sum of the two numbers diagonally above it in the previous row. What is the units digits of the sum of the 2023 numbers in the 2023rd row? | ์ผ๊ฐํ ํํ์ ์ ์ ๋ฐฐ์ด์ 1, 2, 3, 4, 5ํ์ด ์๋์ ๊ฐ์ด ํ์๋๋ค.
1
1 1
1 3 1
1 5 5 1
1 7 11 7 1
์ฒซ ๋ฒ์งธ ํ ์ดํ์ ๊ฐ ํ์ ํ์ ๊ฐ ๋์ 1์ ๋ฐฐ์นํ๊ณ , ๊ฐ ๋ด๋ถ ํญ๋ชฉ์ ์ด์ ํ์์ ๋๊ฐ์ ์์ ์๋ ๋ ์ซ์์ ํฉ๋ณด๋ค 1๋งํผ ํฌ๋ค. 2023๋ฒ์งธ ํ์ ์๋ 2023๊ฐ ์ซ์์ ํฉ์ ์ผ์ ์๋ฆฟ์๋ ์ผ๋ง์ธ๊ฐ? | 5 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_20 |
13 | If $A$ and $B$ are vertices of a polyhedron, define the distance $d(A,B)$ to be the minimum number of edges of the polyhedron one must traverse in order to connect $A$ and $B$. For example, if $\overline{AB}$ is an edge of the polyhedron, then $d(A, B) = 1$, but if $\overline{AC}$ and $\overline{CB}$ are edges and $\overline{AB}$ is not an edge, then $d(A, B) = 2$. Let $Q$, $R$, and $S$ be randomly chosen distinct vertices of a regular icosahedron (regular polyhedron made up of 20 equilateral triangles). Find the probability that $d(Q, R) > d(R, S)$. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | $A$์ $B$๊ฐ ๋ค๋ฉด์ฒด์ ๊ผญ์ง์ ์ด๋ฉด, ๊ฑฐ๋ฆฌ $d(A,B)$๋ฅผ $A$์ $B$๋ฅผ ์ฐ๊ฒฐํ๊ธฐ ์ํด ๋ค๋ฉด์ฒด์ ๋ชจ์๋ฆฌ๋ฅผ ๋ฐ๋ผ ์ด๋ํด์ผ ํ๋ ์ต์ ๊ฐ์๋ก ์ ์ํ๋ค. ์๋ฅผ ๋ค์ด, $\overline{AB}$๊ฐ ๋ค๋ฉด์ฒด์ ๋ชจ์๋ฆฌ์ด๋ฉด $d(A, B) = 1$์ด์ง๋ง, $\overline{AC}$์ $\overline{CB}$๊ฐ ๋ชจ์๋ฆฌ์ด๊ณ $\overline{AB}$๊ฐ ๋ชจ์๋ฆฌ๊ฐ ์๋๋ฉด $d(A, B) = 2$์ด๋ค. $Q$, $R$, $S$๋ฅผ ์ ์ด์ญ๋ฉด์ฒด(์ ์ผ๊ฐํ 20๊ฐ๋ก ์ด๋ฃจ์ด์ง ์ ๋ค๋ฉด์ฒด)์ ์๋ก ๋ค๋ฅธ ๊ผญ์ง์ ์์ ๋ฌด์์๋ก ์ ํํ๋ค๊ณ ๊ฐ์ ํ์. $d(Q, R) > d(R, S)$์ผ ํ๋ฅ ์ ๊ตฌํ์์ค. ์ต์ข
๋ต์ $\frac{m}{n}$ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, ์ฌ๊ธฐ์ $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ์ผ๋ง์ธ๊ฐ? | 29 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_21 |
14 | Let $f$ be the unique function defined on the positive integers such that \[\sum_{d\mid n}d\cdot f\left(\frac{n}{d}\right)=1\] for all positive integers $n$. What is $f(2023)$? | ์์ ์ ์์์ ์ ์๋ ์ ์ผํ ํจ์ $f$๊ฐ ๋ชจ๋ ์์ ์ ์ $n$์ ๋ํด \[\sum_{d\mid n}d\cdot f\left(\frac{n}{d}\right)=1\] ์ ๋ง์กฑํ๋ค๊ณ ํ์. $f(2023)$์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | 96 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_22 |
15 | How many ordered pairs of positive real numbers $(a,b)$ satisfy the equation
\[(1+2a)(2+2b)(2a+b) = 32ab?\] | ์์ ์ค์ ์์์ $(a,b)$ ์ค์์ ๋ฐฉ์ ์
\[(1+2a)(2+2b)(2a+b) = 32ab\]๋ฅผ ๋ง์กฑํ๋ ์์์์ ๋ช ๊ฐ์ธ๊ฐ? | 1 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_23 |
16 | Let $K$ be the number of sequences $A_1$, $A_2$, $\dots$, $A_n$ such that $n$ is a positive integer less than or equal to $10$, each $A_i$ is a subset of $\{1, 2, 3, \dots, 10\}$, and $A_{i-1}$ is a subset of $A_i$ for each $i$ between $2$ and $n$, inclusive. For example, $\{\}$, $\{5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 6, 7, 9\}$ is one such sequence, with $n = 5$.What is the remainder when $K$ is divided by $10$? | $n$์ $10$ ์ดํ์ ์์ ์ ์์ด๊ณ , ๊ฐ $A_i$๋ $\{1, 2, 3, \dots, 10\}$์ ๋ถ๋ถ์งํฉ์ด๋ฉฐ, $2$ ์ด์ $n$ ์ดํ์ ๊ฐ $i$์ ๋ํด $A_{i-1}$์ $A_i$์ ๋ถ๋ถ์งํฉ์ผ ๋, ์์ด $A_1$, $A_2$, $\dots$, $A_n$์ ๊ฐ์๋ฅผ $K$๋ผ๊ณ ํ์. ์๋ฅผ ๋ค์ด, $\{\}$, $\{5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 6, 7, 9\}$๋ $n = 5$์ธ ๊ฒฝ์ฐ์ ํ ๊ฐ์ง ์์ด์ด๋ค. $K$๋ฅผ $10$์ผ๋ก ๋๋ ๋๋จธ์ง๋ ์ผ๋ง์ธ๊ฐ? | 5 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_24 |
17 | There is a unique sequence of integers $a_1, a_2, \cdots a_{2023}$ such that
\[\tan2023x = \frac{a_1 \tan x + a_3 \tan^3 x + a_5 \tan^5 x + \cdots + a_{2023} \tan^{2023} x}{1 + a_2 \tan^2 x + a_4 \tan^4 x \cdots + a_{2022} \tan^{2022} x}\]whenever $\tan 2023x$ is defined. What is $a_{2023}?$ | $\tan 2023x$๊ฐ ์ ์๋ ๋๋ง๋ค
\[\tan2023x = \frac{a_1 \tan x + a_3 \tan^3 x + a_5 \tan^5 x + \cdots + a_{2023} \tan^{2023} x}{1 + a_2 \tan^2 x + a_4 \tan^4 x \cdots + a_{2022} \tan^{2022} x}\]๋ฅผ ๋ง์กฑํ๋ ์ ์ผํ ์ ์ ์์ด $a_1, a_2, \cdots a_{2023}$์ด ์กด์ฌํ๋ค. $a_{2023}$์ ๊ฐ์ ์ผ๋ง์ธ๊ฐ? | -1 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_25 |
18 | How many positive perfect squares less than $2023$ are divisible by $5$? | $2023$๋ณด๋ค ์์ ์์ ์์ ์ ๊ณฑ์ ์ค์์ $5$๋ก ๋๋์ด๋จ์ด์ง๋ ์๋ ๋ช ๊ฐ์ธ๊ฐ? | 8 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_3 |
19 | How many digits are in the base-ten representation of $8^5 \cdot 5^{10} \cdot 15^5$? | $8^5 \cdot 5^{10} \cdot 15^5$์ 10์ง๋ฒ ํํ์ ๋ช ์๋ฆฌ ์ซ์์ธ๊ฐ? | 18 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_4 |
20 | Janet rolls a standard $6$-sided die $4$ times and keeps a running total of the numbers she rolls. What is the probability that at some point, her running total will equal $3$? The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | Janet์ ํ์ค $6$-๋ฉด ์ฃผ์ฌ์๋ฅผ $4$๋ฒ ๊ตด๋ฆฌ๊ณ ๋์จ ์ซ์๋ค์ ๋์ ํฉ๊ณ๋ฅผ ๊ณ์ํด์ ๊ณ์ฐํ๋ค. ์ด๋ ์์ ์์ ๊ทธ๋
์ ๋์ ํฉ๊ณ๊ฐ $3$์ด ๋ ํ๋ฅ ์ ์ผ๋ง์ธ๊ฐ? ์ต์ข
๋ต์ $\frac{m}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, ์ฌ๊ธฐ์ $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ์ผ๋ง์ธ๊ฐ? | 265 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_5 |
21 | Points $A$ and $B$ lie on the graph of $y=\log_{2}x$. The midpoint of $\overline{AB}$ is $(6, 2)$. What is the positive difference between the $x$-coordinates of $A$ and $B$? The final answer can be written in the form $m \sqrt{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | ์ $A$์ $B$๋ $y=\log_{2}x$ ๊ทธ๋ํ ์์ ์๋ค. $\overline{AB}$์ ์ค์ ์ $(6, 2)$์ด๋ค. $A$์ $B$์ $x$-์ขํ ์ฌ์ด์ ์์ ์ฐจ์ด๋ ์ผ๋ง์ธ๊ฐ? ์ต์ข
๋ต์ $m \sqrt{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, ์ฌ๊ธฐ์ $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ์ผ๋ง์ธ๊ฐ? | 9 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_6 |
22 | A digital display shows the current date as an $8$-digit integer consisting of a $4$-digit year, followed by a $2$-digit month, followed by a $2$-digit date within the month. For example, Arbor Day this year is displayed as 20230428. For how many dates in $2023$ will each digit appear an even number of times in the 8-digital display for that date? | ๋์งํธ ๋์คํ๋ ์ด๋ ํ์ฌ ๋ ์ง๋ฅผ 4์๋ฆฌ ์ฐ๋, 2์๋ฆฌ ์, 2์๋ฆฌ ์ผ๋ก ๊ตฌ์ฑ๋ 8์๋ฆฌ ์ ์๋ก ํ์ํ๋ค. ์๋ฅผ ๋ค์ด, 2023๋
์๋ชฉ์ผ์ 20230405๋ก ํ์๋๋ค. 2023๋
์๋ 8์๋ฆฌ ๋์คํ๋ ์ด์์ ๊ฐ ์ซ์๊ฐ ์ง์ ๋ฒ ๋ํ๋๋ ๋ ์ง๊ฐ ๋ช ๊ฐ์ธ๊ฐ? | 9 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_7 |
23 | Maureen is keeping track of the mean of her quiz scores this semester. If Maureen scores an $11$ on the next quiz, her mean will increase by $1$. If she scores an $11$ on each of the next three quizzes, her mean will increase by $2$. What is the mean of her quiz scores currently? | Maureen์ ์ด๋ฒ ํ๊ธฐ ํด์ฆ ์ ์์ ํ๊ท ์ ๊ธฐ๋กํ๊ณ ์๋ค. Maureen์ด ๋ค์ ํด์ฆ์์ $11$์ ์ ๋ฐ์ผ๋ฉด ํ๊ท ์ด $1$๋งํผ ์ฆ๊ฐํ๋ค. ๋ค์ ์ธ ๋ฒ์ ํด์ฆ์์ ๊ฐ๊ฐ $11$์ ์ ๋ฐ์ผ๋ฉด ํ๊ท ์ด $2$๋งํผ ์ฆ๊ฐํ๋ค. ํ์ฌ ๊ทธ๋
์ ํด์ฆ ์ ์์ ํ๊ท ์ ์ผ๋ง์ธ๊ฐ? | 7 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_8 |
25 | Mrs. Jones is pouring orange juice into four identical glasses for her four sons. She fills the first three glasses completely but runs out of juice when the fourth glass is only $\frac{1}{3}$ full. What fraction of a glass must Mrs. Jones pour from each of the first three glasses into the fourth glass so that all four glasses will have the same amount of juice? The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | Jones ๋ถ์ธ์ ๋ค ์๋ค์๊ฒ ๋๊ฐ์ ๋ค ๊ฐ์ ์์ ์ค๋ ์ง ์ฃผ์ค๋ฅผ ๋ฐ๋ฅด๊ณ ์๋ค. ๊ทธ๋
๋ ์ฒ์ ์ธ ์์ ๊ฐ๋ ์ฑ์ ์ง๋ง ๋ค ๋ฒ์งธ ์์ $\frac{1}{3}$๋ง ์ฑ์์ก์ ๋ ์ฃผ์ค๊ฐ ๋ค ๋จ์ด์ก๋ค. ๋ค ์์ ์ฃผ์ค ์์ ๋๊ฐ์ด ๋ง๋ค๊ธฐ ์ํด ์กด์ค ๋ถ์ธ์ ์ฒ์ ์ธ ์์์ ๋ค ๋ฒ์งธ ์์ผ๋ก ๊ฐ๊ฐ ์ผ๋ง๋งํผ์ ์ฃผ์ค๋ฅผ ๋ฐ๋ผ์ผ ํ๋๊ฐ? ์ต์ข
๋ต์ $\frac{m}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ์ผ๋ง์ธ๊ฐ? | 7 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_1 |
26 | In the $xy$-plane, a circle of radius $4$ with center on the positive $x$-axis is tangent to the $y$-axis at the origin, and a circle with radius $10$ with center on the positive $y$-axis is tangent to the $x$-axis at the origin. What is the slope of the line passing through the two points at which these circles intersect? The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | $xy$-ํ๋ฉด์์, ์์ $x$-์ถ ์์ ์ค์ฌ์ด ์๊ณ ๋ฐ์ง๋ฆ์ด $4$์ธ ์์ด ์์ ์์ $y$-์ถ์ ์ ํ๊ณ , ์์ $y$-์ถ ์์ ์ค์ฌ์ด ์๊ณ ๋ฐ์ง๋ฆ์ด $10$์ธ ์์ด ์์ ์์ $x$-์ถ์ ์ ํ๋ค. ์ด ๋ ์์ด ๊ต์ฐจํ๋ ๋ ์ ์ ์ง๋๋ ์ง์ ์ ๊ธฐ์ธ๊ธฐ๋ ์ผ๋ง์ธ๊ฐ? ์ต์ข
๋ต์ $\frac{m}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ์ผ๋ง์ธ๊ฐ? | 7 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_10 |
27 | Calculate the maximum area of an isosceles trapezoid that has legs of length $1$ and one base twice as long as the other. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m^2+n^2$? | ํํํ์ง ์์ ํ ์์ ๋๋ณ์ ๊ธธ์ด๊ฐ $1$์ด๊ณ ํ ๋ฐ๋ณ์ ๊ธธ์ด๊ฐ ๋ค๋ฅธ ๋ฐ๋ณ ๊ธธ์ด์ ๋ ๋ฐฐ์ธ ๋ฑ๋ณ์ฌ๋ค๋ฆฌ๊ผด์ ์ต๋ ๋์ด๋ฅผ ๊ตฌํ์์ค. ์ต์ข
๋ต์ $\frac{m}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m^2+n^2$์ ์ผ๋ง์ธ๊ฐ? | 13 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_11 |
28 | For complex number $u = a+bi$ and $v = c+di$ (where $i=\sqrt{-1}$), define the binary operation
$u \otimes v = ac + bdi$
Suppose $z$ is a complex number such that $z\otimes z = z^{2}+40$. What is $|z|^2$? | ๋ณต์์ $u = a+bi$ ์ $v = c+di$ (๋จ, $i=\sqrt{-1}$)์ ๋ํด, ์ดํญ ์ฐ์ฐ์ ๋ค์๊ณผ ๊ฐ์ด ์ ์ํ๋ค.
$u \otimes v = ac + bdi$
$z\otimes z = z^{2}+40$์ ๋ง์กฑํ๋ ๋ณต์์ $z$๊ฐ ์๋ค๊ณ ๊ฐ์ ํ์. $|z|^2$์ ์ผ๋ง์ธ๊ฐ? | 50 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_12 |
29 | A rectangular box $P$ has distinct edge lengths $a$, $b$, and $c$. The sum of the lengths of all $12$ edges of $P$ is $13$, the areas of all $6$ faces of $P$ is $\frac{11}{2}$, and the volume of $P$ is $\frac{1}{2}$. Find the length of the longest interior diagonal connecting two vertices of $P$. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | ์ง์ก๋ฉด์ฒด $P$๋ ์๋ก ๋ค๋ฅธ ๋ชจ์๋ฆฌ ๊ธธ์ด $a$, $b$, $c$๋ฅผ ๊ฐ๋๋ค. $P$์ ๋ชจ๋ $12$๊ฐ ๋ชจ์๋ฆฌ ๊ธธ์ด์ ํฉ์ $13$์ด๊ณ , $P$์ ๋ชจ๋ $6$๊ฐ ๋ฉด์ ๋์ด์ ํฉ์ $\frac{11}{2}$์ด๋ฉฐ, $P$์ ๋ถํผ๋ $\frac{1}{2}$์ด๋ค. $P$์ ๋ ๊ผญ์ง์ ์ ์ฐ๊ฒฐํ๋ ๊ฐ์ฅ ๊ธด ๋ด๋ถ ๋๊ฐ์ ์ ๊ธธ์ด๋ฅผ ๊ตฌํ์์ค. ์ต์ข
๋ต์ $\frac{m}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ์ผ๋ง์ธ๊ฐ? | 13 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_13 |
30 | For how many ordered pairs $(a,b)$ of integers does the polynomial $x^3+ax^2+bx+6$ have $3$ distinct integer roots? | ์ ์๋ค์ ์์์ $(a,b)$ ์ค ๋คํญ์ $x^3+ax^2+bx+6$ ์ด ์๋ก ๋ค๋ฅธ 3๊ฐ์ ์ ์ ๊ทผ์ ๊ฐ๋ ๊ฒฝ์ฐ๋ ๋ช ๊ฐ์ธ๊ฐ? | 5 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_14 |
32 | In the state of Coinland, coins have values $6,10,$ and $15$ cents. Suppose $x$ is the value in cents of the most expensive item in Coinland that cannot be purchased using these coins with exact change. What is the sum of the digits of $x?$ | Coinland๋ผ๋ ๋๋ผ์์๋ ๋์ ์ ๊ฐ์น๊ฐ $6, 10, 15$ ์ผํธ์ด๋ค. $x$ ๋ฅผ ์ด ๋์ ๋ค์ ์ฌ์ฉํ์ฌ ๊ฑฐ์ค๋ฆ๋ ์์ด ๊ตฌ๋งคํ ์ ์๋ Coinland์์ ๊ฐ์ฅ ๋น์ผ ๋ฌผ๊ฑด์ ๊ฐ๊ฒฉ(์ผํธ ๋จ์)์ด๋ผ๊ณ ๊ฐ์ ํ์. $x$ ์ ๊ฐ ์๋ฆฟ์์ ํฉ์ ์ผ๋ง์ธ๊ฐ? | 11 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_16 |
33 | Triangle $ABC$ has side lengths in arithmetic progression, and the smallest side has length $6.$ If the triangle has an angle of $120^\circ,$ Find the area of $ABC$. The final answer can be simplified in the form $m \sqrt{n}$, where $m$ and $n$ are positive integers and $n$ without square factore. What is $m+n$? | ์ผ๊ฐํ $ABC$ ์ ๋ณ์ ๊ธธ์ด๊ฐ ๋ฑ์ฐจ์์ด์ ์ด๋ฃจ๊ณ ๊ฐ์ฅ ์งง์ ๋ณ์ ๊ธธ์ด๊ฐ $6$์ด๋ค. ์ผ๊ฐํ์ ํ ๊ฐ์ด $120^\circ$ ๋ผ๋ฉด, $ABC$ ์ ๋์ด๋ฅผ ๊ตฌํ์์ค. ์ต์ข
๋ต์ $m \sqrt{n}$ ํํ๋ก ๊ฐ์ํํ ์ ์์ผ๋ฉฐ, $m$ ๊ณผ $n$ ์ ์์ ์ ์์ด๊ณ $n$ ์ ์ ๊ณฑ ์ธ์๊ฐ ์๋ค. $m+n$ ์ ์ผ๋ง์ธ๊ฐ? | 18 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_17 |
36 | Carlos went to a sports store to buy running shoes. Running shoes were on sale, with prices reduced by $20\%$ on every pair of shoes. Carlos also knew that he had to pay a $7.5\%$ sales tax on the discounted price. He had $$43$ dollars. What is the original (before discount) price of the most expensive shoes he could afford to buy? | Carlos๋ ์ด๋ํ๋ฅผ ์ฌ๋ฌ ์คํฌ์ธ ์ฉํ์ ์ ๊ฐ๋ค. ์ด๋ํ๋ ๋ชจ๋ ์ผค๋ ์ ๋ํด $20\%$ ํ ์ธ๋ ๊ฐ๊ฒฉ์ผ๋ก ํ๋งค๋๊ณ ์์๋ค. Carlos๋ ๋ํ ํ ์ธ๋ ๊ฐ๊ฒฉ์ $7.5\%$ ์ ํ๋งค์ธ๋ฅผ ์ง๋ถํด์ผ ํ๋ค๋ ๊ฒ์ ์๊ณ ์์๋ค. ๊ทธ๋ $$43$ ๋ฌ๋ฌ๋ฅผ ๊ฐ์ง๊ณ ์์๋ค. ๊ทธ๊ฐ ์ด ์ ์๋ ๊ฐ์ฅ ๋น์ผ ์ ๋ฐ์ ์๋ ๊ฐ๊ฒฉ(ํ ์ธ ์ )์ ์ผ๋ง์ธ๊ฐ? | 50 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_2 |
40 | When $n$ standard six-sided dice are rolled, the product of the numbers rolled can be any of $936$ possible values. What is $n$? | ํ์ค 6๋ฉด์ฒด ์ฃผ์ฌ์ $n$ ๊ฐ๋ฅผ ๋์ง ๋, ๋์จ ์ซ์๋ค์ ๊ณฑ์ $936$ ๊ฐ์ ๊ฐ๋ฅํ ๊ฐ ์ค ํ๋๊ฐ ๋ ์ ์๋ค. $n$์ ์ผ๋ง์ธ๊ฐ? | 11 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_23 |
41 | Suppose that $a$, $b$, $c$ and $d$ are positive integers satisfying all of the following relations.
\[abcd=2^6\cdot 3^9\cdot 5^7\]
\[\text{lcm}(a,b)=2^3\cdot 3^2\cdot 5^3\]
\[\text{lcm}(a,c)=2^3\cdot 3^3\cdot 5^3\]
\[\text{lcm}(a,d)=2^3\cdot 3^3\cdot 5^3\]
\[\text{lcm}(b,c)=2^1\cdot 3^3\cdot 5^2\]
\[\text{lcm}(b,d)=2^2\cdot 3^3\cdot 5^2\]
\[\text{lcm}(c,d)=2^2\cdot 3^3\cdot 5^2\]
What is $\text{gcd}(a,b,c,d)$? | $a$, $b$, $c$, $d$๊ฐ ๋ค์ ๊ด๊ณ์์ ๋ชจ๋ ๋ง์กฑํ๋ ์์ ์ ์๋ผ๊ณ ๊ฐ์ ํ์.
\[abcd=2^6\cdot 3^9\cdot 5^7\]
\[\text{lcm}(a,b)=2^3\cdot 3^2\cdot 5^3\]
\[\text{lcm}(a,c)=2^3\cdot 3^3\cdot 5^3\]
\[\text{lcm}(a,d)=2^3\cdot 3^3\cdot 5^3\]
\[\text{lcm}(b,c)=2^1\cdot 3^3\cdot 5^2\]
\[\text{lcm}(b,d)=2^2\cdot 3^3\cdot 5^2\]
\[\text{lcm}(c,d)=2^2\cdot 3^3\cdot 5^2\]
$\text{gcd}(a,b,c,d)$๋ ๋ฌด์์ธ๊ฐ? | 3 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_24 |
43 | A $3-4-5$ right triangle is inscribed in circle $A$, and a $5-12-13$ right triangle is inscribed in circle $B$. Find the ratio of the area of circle $A$ to the area of circle $B$. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$? | $3-4-5$ ์ง๊ฐ ์ผ๊ฐํ์ด ์ $A$์ ๋ด์ ํ๊ณ , $5-12-13$ ์ง๊ฐ ์ผ๊ฐํ์ด ์ $B$์ ๋ด์ ํ๋ค. ์ $A$์ ๋์ด์ ์ $B$์ ๋์ด์ ๋น์จ์ ๊ตฌํ์์ค. ์ต์ข
๋ต์ $\frac{m}{n}$์ ํํ๋ก ์ธ ์ ์์ผ๋ฉฐ, $m$๊ณผ $n$์ ์๋ก์์ธ ์์ ์ ์์ด๋ค. $m+n$์ ๋ฌด์์ธ๊ฐ? | 194 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_3 |
44 | Jackson's paintbrush makes a narrow strip with a width of $6.5$ millimeters. Jackson has enough paint to make a strip $25$ meters long. How many square centimeters of paper could Jackson cover with paint? | Jackson์ ๋ถ์ ๋๋น๊ฐ $6.5$ ๋ฐ๋ฆฌ๋ฏธํฐ์ธ ์ข์ ๋ ๋ฅผ ๋ง๋ ๋ค. Jackson์ $25$ ๋ฏธํฐ ๊ธธ์ด์ ๋ ๋ฅผ ๋ง๋ค ์ ์๋ ์ถฉ๋ถํ ํ์ธํธ๋ฅผ ๊ฐ์ง๊ณ ์๋ค. Jackson์ ๋ช ์ ๊ณฑ์ผํฐ๋ฏธํฐ์ ์ข
์ด๋ฅผ ํ์ธํธ๋ก ๋ฎ์ ์ ์๋๊ฐ? | 1,625 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_4 |
45 | You are playing a game. A $2 \times 1$ rectangle covers two adjacent squares (oriented either horizontally or vertically) of a $3 \times 3$ grid of squares, but you are not told which two squares are covered. Your goal is to find at least one square that is covered by the rectangle. A "turn" consists of you guessing a square, after which you are told whether that square is covered by the hidden rectangle. What is the minimum number of turns you need to ensure that at least one of your guessed squares is covered by the rectangle? | ๋น์ ์ ๊ฒ์์ ํ๊ณ ์๋ค. $2 \times 1$ ์ง์ฌ๊ฐํ์ $3 \times 3$ ๊ฒฉ์์ ์ธ์ ํ ๋ ์ ์ฌ๊ฐํ(๊ฐ๋ก ๋๋ ์ธ๋ก ๋ฐฉํฅ)์ ๋ฎ์ง๋ง ์ด๋ค ๋ ์ ์ฌ๊ฐํ์ด ๋ฎ์ฌ ์๋์ง๋ ์๋ ค์ฃผ์ง ์๋๋ค. ๋น์ ์ ๋ชฉํ๋ ์ง์ฌ๊ฐํ์ผ๋ก ๋ฎ์ธ ์ ์ฌ๊ฐํ์ ์ ์ด๋ ํ๋ ์ฐพ๋ ๊ฒ์ด๋ค. ํ "ํด"์ ๋น์ ์ด ์ ์ฌ๊ฐํ์ ์ถ์ธกํ๋ ๊ฒ์ผ๋ก ๊ตฌ์ฑ๋๋ฉฐ, ๊ทธ ํ์ ๋น์ ์ ๊ทธ ์ ์ฌ๊ฐํ์ด ์จ๊ฒจ์ง ์ง์ฌ๊ฐํ์ผ๋ก ๋ฎ์ฌ ์๋์ง ์ฌ๋ถ๋ฅผ ์๊ฒ ๋๋ค. ์ถ์ธกํ ์ ์ฌ๊ฐํ๋ค ์ค ์ ์ด๋ ํ๋๊ฐ ์ง์ฌ๊ฐํ์ผ๋ก ๋ฎ์ฌ ์๋๋ก ํ๋ ค๋ฉด ์ต์ ๋ช ํด์ด ํ์ํ๊ฐ? | 4 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_5 |
46 | When the roots of the polynomial
\[P(x) = (x-1)^1 (x-2)^2 (x-3)^3 \cdot \cdot \cdot (x-10)^{10}\]
are removed from the number line, what remains is the union of $11$ disjoint open intervals. On how many of these intervals is $P(x)$ positive? | ๋คํญ์
\[P(x) = (x-1)^1 (x-2)^2 (x-3)^3 \cdot \cdot \cdot (x-10)^{10}\]
์ ๊ทผ์ ์์ง์ ์์ ์ ๊ฑฐํ๋ฉด, ๋จ์ ๊ฒ์ 11๊ฐ์ ์๋ก์์ธ ์ด๋ฆฐ ๊ตฌ๊ฐ์ ํฉ์งํฉ์ด๋ค. ์ด๋ฌํ ๊ตฌ๊ฐ ์ค ๋ช ๊ฐ์์ $P(x)$๊ฐ ์์์ธ๊ฐ? | 6 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_6 |
47 | For how many integers $n$ does the expression\[\sqrt{\frac{\log (n^2) - (\log n)^2}{\log n - 3}}\]represent a real number, where log denotes the base $10$ logarithm? | ์ \[\sqrt{\frac{\log (n^2) - (\log n)^2}{\log n - 3}}\]์ด ์ค์๊ฐ ๋๋ ์ ์ $n$์ ๋ช ๊ฐ์ธ๊ฐ? ์ฌ๊ธฐ์ log๋ ๋ฐ์ด $10$์ธ ๋ก๊ทธ๋ฅผ ๋ํ๋ธ๋ค. | 901 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_7 |
48 | How many nonempty subsets $B$ of ${0, 1, 2, 3, \cdots, 12}$ have the property that the number of elements in $B$ is equal to the least element of $B$? For example, $B = {4, 6, 8, 11}$ satisfies the condition. | ${0, 1, 2, 3, \cdots, 12}$์ ๊ณต์งํฉ์ด ์๋ ๋ถ๋ถ์งํฉ $B$ ์ค์์, $B$์ ์์ ๊ฐ์๊ฐ $B$์ ์ต์ ์์์ ๊ฐ์ ๋ถ๋ถ์งํฉ์ ๋ช ๊ฐ์ธ๊ฐ? ์๋ฅผ ๋ค์ด, $B = {4, 6, 8, 11}$์ ์กฐ๊ฑด์ ๋ง์กฑํ๋ค. | 144 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_8 |
49 | What is the area of the region in the coordinate plane defined by
$| | x | - 1 | + | | y | - 1 | \le 1$? | ์ขํํ๋ฉด์์ $| | x | - 1 | + | | y | - 1 | \le 1$์ผ๋ก ์ ์๋ ์์ญ์ ๋์ด๋ ์ผ๋ง์ธ๊ฐ? | 8 | https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_9 |
All 83 come from AMC12 2022, AMC12 2023, and have been extracted from the AOPS wiki page https://artofproblemsolving.com/wiki/index.php/AMC_12_Problems_and_Solutions
This dataset serves as an internal validation set during our participation in the AIMO progress prize competition. Using data after 2021 is to avoid potential overlap with the MATH training set.
Here are the different columns in the dataset:
The original AMC12 problems are MCQ with 4 choices. In order to be closer to the AIMO progress prize condition, we modified the problem statement to have an integer output. Those problems whose statement can not be modified are rejected.
Example:
Flora the frog starts at 0 on the number line and makes a sequence of jumps to the right. In any one jump, independent of previous jumps, Flora leaps a positive integer distance $m$ with probability $\frac{1}{2^m}$.
What is the probability that Flora will eventually land at 10?
$\textbf{(A)}~\frac{5}{512}\qquad\textbf{(B)}~\frac{45}{1024}\qquad\textbf{(C)}~\frac{127}{1024}\qquad\textbf{(D)}~\frac{511}{1024}\qquad\textbf{(E)}~\frac{1}{2}$
Flora the frog starts at 0 on the number line and makes a sequence of jumps to the right. In any one jump, independent of previous jumps, Flora leaps a positive integer distance $m$ with probability $\frac{1}{2^m}$.
What is the probability that Flora will eventually land at 10? Write the answer as a simplified fraction $\frac{m}{n}$, find $m+n$