meetforever/GRPO_CL huggingface dataset:
user: If $f$ is a continuous real function such that $ f(x-1) + f(x+1) \ge x + f(x) $ for all $x$, what is the minimum possible value of $ \displaystyle\int_{1}^{2005} f(x) \, \mathrm{d}x $?
Answer: 2010012
user: Let $ f(x) = x^3 + ax + b $, with $ a \ne b $, and suppose the tangent lines to the graph of $f$ at $x=a$ and $x=b$ are parallel. Find $f(1)$.
Answer: 1
user: The number $27,\,000,\,001$ has exactly four prime factors. Find their sum.
Answer: 652
user: A dot is marked at each vertex of a triangle $ABC$. Then, $2$, $3$, and $7$ more dots are marked on the sides $AB$, $BC$, and $CA$, respectively. How many triangles have their vertices at these dots?
Answer: 357
user: Vernonia High School has 85 seniors, each of whom plays on at least one of the school’s three varsity sports teams: football, baseball, and lacrosse. It so happens that $74$ are on the football team; $26$ are on the baseball team; $17$ are on both the football and lacrosse teams; $18$ are on both the baseball and football teams; and $13$ are on both the baseball and lacrosse teams. Compute the number of seniors playing all three sports, given that twice this number are members of the lacrosse team.
Answer: 11
user: Tim has a working analog 12-hour clock with two hands that run continuously (instead of, say, jumping on the minute). He also has a clock that runs really slow—at half the correct rate, to be exact. At noon one day, both clocks happen to show the exact time. At any given instant, the hands on each clock form an angle between $0^\circ$ and $180^\circ$ inclusive. At how many times during that day are the angles on the two clocks equal?
Answer: 33
user: Let $A$, $B$, $C$, and $D$ be points on a circle such that $AB=11$ and $CD=19$.  Point $P$ is on segment $AB$ with $AP=6$, and $Q$ is on segment $CD$ with $CQ=7$.  The line through $P$ and $Q$ intersects the circle at $X$ and $Y$.  If $PQ=27$, find $XY$.
Answer: 31
user: Fifteen freshmen are sitting in a circle around a table, but the course assistant (who remains standing) has made only six copies of today’s handout. No freshman should get more than one handout, and any freshman who does not get one should be able to read a neighbor’s. If the freshmen are distinguishable but the handouts are not, how many ways are there to distribute the six handouts subject to the above conditions?
Answer: 125
user: Eight celebrities meet at a party. It so happens that each celebrity shakes hands with exactly two others. A fan makes a list of all unordered pairs of celebrities who shook hands with each other. If order does not matter, how many different lists are possible?
Answer: 3507
user: Somewhere in the universe, $n$ students are taking a $10$-question math competition.  Their collective performance is called [i]laughable[/i] if, for some pair of questions, there exist $57$ students such that either all of them answered both questions correctly or none of them answered both questions correctly.  Compute the smallest $n$ such that the performance is necessarily laughable.
Answer: 253
user: Let $a,b,c$ be the roots of $x^3-9x^2+11x-1=0$, and let $s=\sqrt{a}+\sqrt{b}+\sqrt{c}$.  Find $s^4-18s^2-8s$.
Answer: -37
user: Triangle $ABC$ has side lengths $AB=65$, $BC=33$, and $AC=56$.  Find the radius of the circle tangent to sides $AC$ and $BC$ and to the circumcircle of triangle $ABC$.
Answer: 24
user: For how many ordered triplets $(a,b,c)$ of positive integers less than $10$ is the product $a\times b\times c$ divisible by $20$?
Answer: 102
user: Let \[f(x)=x^4-6x^3+26x^2-46x+65.\] Let the roots of $f(x)$ be $a_k+ib_k$ for $k=1,2,3,4$.  Given that the $a_k$, $b_k$ are all integers, find $|b_1|+|b_2|+|b_3|+|b_4|.$
Answer: 10
user: A moth starts at vertex $A$ of a certain cube and is trying to get to vertex $B$, which is opposite $A$, in five or fewer “steps,” where a step consists in traveling along an edge from one vertex to another. The moth will stop as soon as it reaches $B$. How many ways can the moth achieve its objective?
Answer: 48
user: The function $f : \mathbb{R}\to\mathbb{R}$ satisfies $f(x^2)f^{\prime\prime}(x)=f^\prime (x)f^\prime (x^2)$ for all real $x$.  Given that $f(1)=1$ and $f^{\prime\prime\prime}(1)=8$, determine $f^\prime (1)+f^{\prime\prime}(1)$.
Answer: 6
user: Compute \[\left\lfloor \dfrac{2007!+2004!}{2006!+2005!}\right\rfloor.\] (Note that $\lfloor x \rfloor$ denotes the greatest integer less than or equal to $x$.)
Answer: 2006
user: We are given some similar triangles.  Their areas are $1^2,3^2,5^2,\cdots,$ and $49^2$.  If the smallest triangle has a perimeter of $4$, what is the sum of all the triangles' perimeters?
Answer: 2500
user: Let $A_{10}$ denote the answer to problem $10$. Two circles lie in the plane; denote the lengths of the internal and external tangents between these two circles by $x$ and $y$, respectively. Given that the product of the radii of these two circles is $15/2$, and that the distance between their centers is $A_{10}$, determine $y^2-x^2$.
Answer: 30
user: Circle $\omega$ has radius $5$ and is centered at $O$.  Point $A$ lies outside $\omega$ such that $OA=13$.  The two tangents to $\omega$ passing through $A$ are drawn, and points $B$ and $C$ are chosen on them (one on each tangent), such that line $BC$ is tangent to $\omega$ and $\omega$ lies outside triangle $ABC$.  Compute $AB+AC$ given that $BC=7$.
Answer: 17
user: Let $x,y,n$ be positive integers with $n>1$. How many ordered triples $(x, y, n)$ of solutions are there to the equation $x^n-y^n=2^{100}$?
Answer: 49
user: A student at Harvard named Kevin
Was counting his stones by $11$
He messed up $n$ times
And instead counted $9$s
And wound up at $2007$.

How many values of $n$ could make this limerick true?
Answer: 21
user: A sequence consists of the digits $122333444455555\ldots$ such that the each positive integer $n$ is repeated $n$ times, in increasing order. Find the sum of the $4501$st and $4052$nd digits of this sequence.
Answer: 13
user: Determine the largest integer $n$ such that $7^{2048}-1$ is divisible by $2^n$.
Answer: 14
user: Let $ABC$ be a triangle with $AB=7$, $BC=9$, and $CA=4$.  Let $D$ be the point such that $AB\parallel CD$ and $CA\parallel BD$.  Let $R$ be a point within triangle $BCD$.  Lines $\ell$ and $m$ going through $R$ are parallel to $CA$ and $AB$ respectively.  Line $\ell$ meets $AB$ and $BC$ at $P$ and $P^\prime$ respectively, and $m$ meets $CA$ and $BC$ at $Q$ and $Q^\prime$ respectively.  If $S$ denotes the largest possible sum of the areas of triangle $BPP^\prime$, $RP^\prime Q^\prime$, and $CQQ^\prime$, determine the value of $S^2$.
Answer: 180
user: Convex quadrilateral $ABCD$ has sides $AB=BC=7$, $CD=5$, and $AD=3$.  Given additionally that $m\angle ABC=60^\circ$, find $BD$.
Answer: 36
user: Compute the largest positive integer such that $\dfrac{2007!}{2007^n}$ is an integer.
Answer: 9
user: In triangle $ABC$, $\angle ABC$ is obtuse.  Point $D$ lies on side $AC$ such that $\angle ABD$ is right, and point $E$ lies on side $AC$ between $A$ and $D$ such that $BD$ bisects $\angle EBC$.  Find $CE$ given that $AC=35$, $BC=7$, and $BE=5$.
Answer: 10
user: Let $A_{12}$ denote the answer to problem $12$.  There exists a unique triple of digits $(B,C,D)$ such that $10>A_{12}>B>C>D>0$ and \[\overline{A_{12}BCD}-\overline{DCBA_{12}}=\overline{BDA_{12}C},\] where $\overline{A_{12}BCD}$ denotes the four digit base $10$ integer.  Compute $B+C+D$.
Answer: 11
user: Find the number of $7$-tuples $(n_1,\ldots,n_7)$ of integers such that \[\sum_{i=1}^7 n_i^6=96957.\]
Answer: 2688
user: Compute the circumradius of cyclic hexagon $ABCDEF$, which has side lengths $AB=BC=2$, $CD=DE=9$, and $EF=FA=12$.
Answer: 8
user: Let $ ABC$ be a triangle with $ BC \equal{} 2007$, $ CA \equal{} 2008$, $ AB \equal{} 2009$. Let $ \omega$ be an excircle of $ ABC$ that touches the line segment $ BC$ at $ D$, and touches extensions of lines $ AC$ and $ AB$ at $ E$ and $ F$, respectively (so that $ C$ lies on segment $ AE$ and $ B$ lies on segment $ AF$). Let $ O$ be the center of $ \omega$. Let $ \ell$ be the line through $ O$ perpendicular to $ AD$. Let $ \ell$ meet line $ EF$ at $ G$. Compute the length $ DG$.
Answer: 2014024
user: Find the smallest positive integer $ n$ such that $ 107n$ has the same last two digits as $ n$.
Answer: 50
user: Let $ C_1$ and $ C_2$ be externally tangent circles with radius 2 and 3, respectively. Let $ C_3$ be a circle internally tangent to both $ C_1$ and $ C_2$ at points $ A$ and $ B$, respectively. The tangents to $ C_3$ at $ A$ and $ B$ meet at $ T$, and $ TA \equal{} 4$. Determine the radius of $ C_3$.
Answer: 8
user: A $ 3\times3\times3$ cube composed of $ 27$ unit cubes rests on a horizontal plane. Determine the number of ways of selecting two distinct unit cubes from a $ 3\times3\times1$ block (the order is irrelevant) with the property that the line joining the centers of the two cubes makes a $ 45^\circ$ angle with the horizontal plane.
Answer: 60
user: Two mathematicians, Kelly and Jason, play a cooperative game. The computer selects some secret positive integer $ n < 60$ (both Kelly and Jason know that $ n < 60$, but that they don't know what the value of $ n$ is). The computer tells Kelly the unit digit of $ n$, and it tells Jason the number of divisors of $ n$. Then, Kelly and Jason have the following dialogue:

Kelly: I don't know what $ n$ is, and I'm sure that you don't know either. However, I know that $ n$ is divisible by at least two different primes.

Jason: Oh, then I know what the value of $ n$ is.

Kelly: Now I also know what $ n$ is.

Assuming that both Kelly and Jason speak truthfully and to the best of their knowledge, what are all the possible values of $ n$?
Answer: 10
user: Trodgor the dragon is burning down a village consisting of $ 90$ cottages.  At time $ t \equal{} 0$ an angry peasant arises from each cottage, and every $ 8$ minutes ($ 480$ seconds) thereafter another angry peasant spontaneously generates from each non-burned cottage.  It takes Trodgor $ 5$ seconds to either burn a peasant or to burn a cottage, but Trodgor cannot begin burning cottages until all the peasants around him have been burned. How many [b]seconds[/b] does it take Trodgor to burn down the entire village?
Answer: 1920
user: The function $ f$ satisfies \[f(x) \plus{} f(2x \plus{} y) \plus{} 5xy \equal{} f(3x \minus{} y) \plus{} 2x^2 \plus{} 1\] for all real numbers $ x$, $ y$. Determine the value of $ f(10)$.
Answer: -49
user: Four students from Harvard, one of them named Jack, and five students from MIT, one of them named Jill, are going to see a Boston Celtics game. However, they found out that only $ 5$ tickets remain, so $ 4$ of them must go back. Suppose that at least one student from each school must go see the game, and at least one of Jack and Jill must go see the game, how many ways are there of choosing which $ 5$ people can see the game?
Answer: 104
user: Determine the number of $ 8$-tuples of nonnegative integers $ (a_1,a_2,a_3,a_4,b_1,b_2,b_3,b_4)$ satisfying $ 0\le a_k\le k$, for each $ k \equal{} 1,2,3,4$, and $ a_1 \plus{} a_2 \plus{} a_3 \plus{} a_4 \plus{} 2b_1 \plus{} 3b_2 \plus{} 4b_3 \plus{} 5b_4 \equal{} 19$.
Answer: 1540
user: Kermit the frog enjoys hopping around the inﬁnite square grid in his backyard. It takes him $ 1$ Joule of energy to hop one step north or one step south, and $ 1$ Joule of energy to hop one step east or one step west. He wakes up one morning on the grid with $ 100$ Joules of energy, and hops till he falls asleep with $ 0$ energy. How many different places could he have gone to sleep?
Answer: 10201
user: Farmer John has $ 5$ cows, $ 4$ pigs, and $ 7$ horses. How many ways can he pair up the animals so that every pair consists of animals of different species? (Assume that all animals are distinguishable from each other.)
Answer: 100800
user: The equation $ x^3 \minus{} 9x^2 \plus{} 8x \plus{} 2 \equal{} 0$ has three real roots $ p$, $ q$, $ r$.  Find $ \frac {1}{p^2} \plus{} \frac {1}{q^2} \plus{} \frac {1}{r^2}$.
Answer: 25
user: Determine the number of ways to select a sequence of $ 8$ sets $ A_1,A_2,\ldots,A_8$, such that each is a subset (possibly empty) of $ \{1,2\}$ and $ A_m$ contains $ A_n$ if $ m$ divides $ n$.
Answer: 2025
user: For a positive integer $ n$, let $ \theta(n)$ denote the number of integers $ 0 \leq x < 2010$ such that $ x^2 \minus{} n$ is divisible by $ 2010$. Determine the remainder when $ \displaystyle \sum_{n \equal{} 0}^{2009} n \cdot \theta(n)$ is divided by $ 2010$.
Answer: 335
user: Cyclic pentagon $ ABCDE$ has a right angle $ \angle{ABC} \equal{} 90^{\circ}$ and side lengths $ AB \equal{} 15$ and $ BC \equal{} 20$. Supposing that $ AB \equal{} DE \equal{} EA$, find $ CD$.
Answer: 7
user: For how many ordered triples $ (a,b,c)$ of positive integers are the equations $ abc\plus{}9 \equal{} ab\plus{}bc\plus{}ca$ and $ a\plus{}b\plus{}c \equal{} 10$ satisfied?
Answer: 21
user: Find the number of subsets $ S$ of $ \{1,2, \dots 63\}$ the sum of whose elements is $ 2008$.
Answer: 6
user: Let $ \mathcal{C}$ be the hyperbola $ y^2 \minus{} x^2 \equal{} 1$.  Given a point $ P_0$ on the $ x$-axis, we construct a sequence of points $ (P_n)$ on the $ x$-axis in the following manner: let $ \ell_n$ be the line with slope $ 1$ passing passing through $ P_n$, then $ P_{n\plus{}1}$ is the orthogonal projection of the point of intersection of $ \ell_n$ and $ \mathcal C$ onto the $ x$-axis. (If $ P_n \equal{} 0$, then the sequence simply terminates.)

Let $ N$ be the number of starting positions $ P_0$ on the $ x$-axis such that $ P_0 \equal{} P_{2008}$. Determine the remainder of $ N$ when divided by $ 2008$.
Answer: 254
user: Let $ f(x) \equal{} 1 \plus{} x \plus{} x^2 \plus{} \cdots \plus{} x^{100}$. Find $ f'(1)$.
Answer: 5050
user: Let $ f(x) \equal{} x^3 \plus{} x \plus{} 1$. Suppose $ g$ is a cubic polynomial such that $ g(0) \equal{} \minus{} 1$, and the roots of $ g$ are the squares of the roots of $ f$. Find $ g(9)$.
Answer: 899
user: There are $ 5$ dogs, $ 4$ cats, and $ 7$ bowls of milk at an animal gathering. Dogs and cats are distinguishable, but all bowls of milk are the same. In how many ways can every dog and cat be paired with either a member of the other species or a bowl of milk such that all the bowls of milk are taken?
Answer: 20
user: Let $ f(n)$ be the number of times you have to hit the $ \sqrt {\ }$ key on a calculator to get a number less than $ 2$ starting from $ n$. For instance, $ f(2) \equal{} 1$, $ f(5) \equal{} 2$. For how many $ 1 < m < 2008$ is $ f(m)$ odd?
Answer: 242
user: Alice and the Cheshire Cat play a game. At each step, Alice either (1) gives the cat a penny, which causes the cat to change the number of (magic) beans that Alice has from $ n$ to $ 5n$ or (2) gives the cat a nickel, which causes the cat to give Alice another bean. Alice wins (and the cat disappears) as soon as the number of beans Alice has is greater than $ 2008$ and has last two digits $ 42$. What is the minimum number of cents Alice can spend to win the game, assuming she starts with 0 beans?
Answer: 35
user: The squares of a $3\times3$ grid are filled with positive integers such that $1$ is the label of the upper- leftmost square, $2009$ is the label of the lower-rightmost square, and the label of each square divides the  ne directly to the right of it and the one directly below it. How many such labelings are possible?
Answer: 2448
user: Suppose $a$, $b$ and $c$ are integers such that the greatest common divisor of $x^2+ax+b$ and $x^2+bx+c$ is $x+1$ (in the set of polynomials in $x$ with integer coefficients), and the least common multiple of $x^2+ax+b$ and $x^2+bx+c$ $x^3-4x^2+x+6$.  Find $a+b+c$.
Answer: -6
user: Let $f(x) =x^4+14x^3+52x^2+56x+16.$  Let $z_1, z_2, z_3, z_4$ be the four roots of $f$.  Find the smallest possible value of $|z_az_b+z_cz_d|$ where $\{a,b,c,d\}=\{1,2,3,4\}$.
Answer: 8
user: Compute \[\int_1^{\sqrt{3}} x^{2x^2+1}+\ln\left(x^{2x^{2x^2+1}}\right)dx.\]
Answer: 13
user: If $a, b, x$ and $y$ are real numbers such that $ax + by = 3,$ $ax^2+by^2=7,$ $ax^3+bx^3=16$, and $ax^4+by^4=42,$ find $ax^5+by^5$.
Answer: 20
user: Let $s(n)$ denote the number of $1$'s in the binary representation of $n$. Compute
\[
\frac{1}{255}\sum_{0\leq n<16}2^n(-1)^{s(n)}.
\]
Answer: 45
user: How many rearrangements of the letters of "$HMMTHMMT$" do not contain the substring "$HMMT$"? (For instance, one such arrangement is $HMMHMTMT$.)
Answer: 361
user: Let $a$, $b$, and $c$ be the $3$ roots of $x^3-x+1=0$.  Find $\frac{1}{a+1}+\frac{1}{b+1}+\frac{1}{c+1}.$
Answer: -2
user: Let $S$ be the sum of all the real coefficients of the expansion of $(1+ix)^{2009}$.  What is $\log_2(S)$?
Answer: 1004
user: How many sequences of $5$ positive integers $(a,b,c,d,e)$ satisfy $abcde\leq a+b+c+d+e\leq10$?
Answer: 116
user: Suppose N is a $6$-digit number having base-$10$ representation $\underline{a}\text{ }\underline{b}\text{ }\underline{c}\text{ }\underline{d}\text{ }\underline{e}\text{ }\underline{f}$.  If $N$ is $6/7$ of the number having base-$10$ representation $\underline{d}\text{ }\underline{e}\text{ }\underline{f}\text{ }\underline{a}\text{ }\underline{b}\text{ }\underline{c}$, find $N$.
Answer: 461538
user: There are $5$ students on a team for a math competition. The math competition has $5$ subject tests. Each student on the team must choose $2$ distinct tests, and each test must be taken by exactly two people. In how many ways can this be done?
Answer: 2040
user: How many functions $f : f\{1, 2, 3, 4, 5\}\longrightarrow\{1, 2, 3, 4, 5\}$ satisfy $f(f(x)) = f(x)$ for all $x\in\{ 1,2, 3, 4, 5\}$?
Answer: 196
user: Points $A$ and $B$ lie on circle $\omega$.  Point $P$ lies on the extension of segment $AB$ past $B$.  Line $\ell$ passes through $P$ and is tangent to $\omega$.  The tangents to $\omega$ at points $A$ and $B$ intersect $\ell$ at points $D$ and $C$ respectively.  Given that $AB=7$, $BC=2$, and $AD=3$, compute $BP$.
Answer: 9
user: Triangle $ABC$ has side lengths $AB=231$, $BC=160$, and $AC=281$.  Point $D$ is constructed on the opposite side of line $AC$ as point $B$ such that $AD=178$ and $CD=153$.  Compute the distance from $B$ to the midpoint of segment $AD$.
Answer: 208
user: Let $x$ and $y$ be positive real numbers and $\theta$ an angle such that $\theta \neq \frac{\pi}{2}n$ for any integer $n$.  Suppose
\[\frac{\sin\theta}{x}=\frac{\cos\theta}{y}\]
and
\[
\frac{\cos^4 \theta}{x^4}+\frac{\sin^4\theta}{y^4}=\frac{97\sin2\theta}{x^3y+y^3x}.
\]
Compute $\frac xy+\frac yx.$
Answer: 4
user: Let $a,b,c,x,y,$ and $z$ be complex numbers such that \[a=\dfrac{b+c}{x-2},\qquad b=\dfrac{c+a}{y-2},\qquad c=\dfrac{a+b}{z-2}.\] If $xy+yz+xz=67$ and $x+y+z=2010$, find the value of $xyz$.
Answer: -5892
user: A sphere is the set of points at a fixed positive distance $r$ from its center. Let $\mathcal{S}$ be a set of $2010$-dimensional spheres. Suppose that the number of points lying on every element of $\mathcal{S}$ is a finite number $n$. Find the maximal possible value of $n$.
Answer: 2
user: Suppose that a polynomial of the form $p(x)=x^{2010}\pm x^{2009}\pm \cdots \pm x \pm 1$ has no real roots.  What is the maximum possible number of coefficients of $-1$ in $p$?
Answer: 1005
user: How many polynomials of degree exactly $5$ with real coefficients send the set $\{1, 2, 3, 4, 5, 6\}$ to a permutation of itself?
Answer: 714
user: Let $S_0=0$ and let $S_k$ equal $a_1+2a_2+\ldots+ka_k$ for $k\geq 1$.  Define $a_i$ to be $1$ if $S_{i-1}<i$ and $-1$ if $S_{i-1}\geq i$.  What is the largest $k\leq 2010$ such that $S_k=0$?
Answer: 1092
user: Let $f(x)=cx(x-1)$, where $c$ is a positive real number.  We use $f^n(x)$ to denote the polynomial obtained by composing $f$ with itself $n$ times.  For every positive integer $n$, all the roots of $f^n(x)$ are real.  What is the smallest possible value of $c$?
Answer: 2
user: Suppose that $p(x)$ is a polynomial and that $p(x)-p^\prime (x)=x^2+2x+1$.  Compute $p(5)$.
Answer: 50
user: Suppose that $x$ and $y$ are complex numbers such that $x+y=1$ and $x^{20}+y^{20}=20$.  Find the sum of all possible values of $x^2+y^2$.
Answer: -90
user: Let $f(x)=x^3-x^2$.  For a given value of $x$, the graph of $f(x)$, together with the graph of the line $c+x$, split the plane up into regions.  Suppose that $c$ is such that exactly two of these regions have finite area.  Find the value of $c$ that minimizes the sum of the areas of these two regions.
Answer: 1005
user: Let $A = \{1,2,\ldots,2011\}$.  Find the number of functions $f$ from $A$ to $A$ that satisfy $f(n) \le n$ for all $n$ in $A$ and attain exactly $2010$ distinct values.
Answer: 2
user: How many polynomials $P$ with integer coefficients and degree at most $5$ satisfy $0 \le P(x) < 120$ for all $x \in \{0,1,2,3,4,5\}$?
Answer: 86400000
user: Let $x_1=y_1=x_2=y_2=1$, then for $n\geq 3$ let $x_n=x_{n-1}y_{n-2}+x_{n-2}y_{n-1}$ and $y_n=y_{n-1}y_{n-2}-x_{n-1}x_{n-2}$.  What are the last two digits of $|x_{2012}|?$
Answer: 84
user: Suppose that there are $16$ variables $\{a_{i,j}\}_{0\leq i,j\leq 3}$, each of which may be $0$ or $1$.  For how many settings of the variables $a_{i,j}$ do there exist positive reals $c_{i,j}$ such that the polynomial \[f(x,y)=\sum_{0\leq i,j\leq 3}a_{i,j}c_{i,j}x^iy^j\] $(x,y\in\mathbb{R})$ is bounded below?
Answer: 126
user: You are given an unlimited supply of red, blue, and yellow cards to form a hand. Each card has a point value and your score is the sum of the point values of those cards. The point values are as follows: the value of each red card is 1, the value of each blue card is equal to twice the number of red cards, and the value of each yellow card is equal to three times the number of blue cards. What is the maximum score you can get with ﬁfteen cards?
Answer: 168
user: How many real triples $(a,b,c)$ are there such that the polynomial $p(x)=x^4+ax^3+bx^2+ax+c$ has exactly three distinct roots, which are equal to $\tan y$, $\tan 2y$, and $\tan 3y$ for some real number $y$?
Answer: 18
user: Define the sequence of positive integers $\{a_n\}$ as follows.  Let $a_1=1$, $a_2=3$, and for each $n>2$, let $a_n$ be the result of expressing $a_{n-1}$ in base $n-1$, then reading the resulting numeral in base $n$, then adding $2$ (in base $n$).  For example, $a_2=3_{10}=11_2$, so $a_3=11_3+2_3=6_{10}$.  Express $a_{2013}$ in base $10$.
Answer: 23097
user: Let $ABC$ be an obtuse triangle with circumcenter $O$ such that $\angle ABC = 15^o$ and $\angle  BAC > 90^o$. Suppose that $AO$ meets $BC$ at $D$, and that $OD^2 + OC \cdot DC = OC^2$. Find $\angle  C$.
Answer: 35
user: An isosceles trapezoid $ABCD$ with bases $AB$ and $CD$ has $AB=13$, $CD=17$, and height $3$.  Let $E$ be the intersection of $AC$ and $BD$.  Circles $\Omega$ and $\omega$ are circumscribed about triangles $ABE$ and $CDE$.  Compute the sum of the radii of $\Omega$ and $\omega$.
Answer: 39
user: Determine all real values of $A$ for which there exist distinct complex numbers $x_1$, $x_2$ such that the following three equations hold:
\begin{align*}x_1(x_1+1)&=A\\x_2(x_2+1)&=A\\x_1^4+3x_1^3+5x_1&=x_2^4+3x_2^3+5x_2.\end{align*}
Answer: -7
user: Find the smallest positive integer $n$ such that $\dfrac{5^{n+1}+2^{n+1}}{5^n+2^n}>4.99$.
Answer: 7
user: Let $S$ be the set of integers of the form $2^x+2^y+2^z$, where $x,y,z$ are pairwise distinct non-negative integers.  Determine the $100$th smallest element of $S$.
Answer: 577
user: Find the number of positive divisors $d$ of $15!=15\cdot 14\cdot\cdots\cdot 2\cdot 1$ such that $\gcd(d,60)=5$.
Answer: 36
user: Let $ABCD$ be a quadrilateral such that $\angle ABC = \angle  CDA = 90^o$, and $BC = 7$. Let $E$ and $F$ be on $BD$ such that $AE$ and $CF$ are perpendicular to BD. Suppose that $BE = 3$. Determine the product of the smallest and largest possible lengths of $DF$.
Answer: 9
user: I have $8$ unit cubes of different colors, which I want to glue together into a $2\times 2\times 2$ cube.  How many distinct $2\times 2\times 2$ cubes can I make?  Rotations of the same cube are not considered distinct, but reflections are.
Answer: 1680
user: For how many integers $1\leq k\leq 2013$ does the decimal representation of $k^k$ end with a $1$?
Answer: 202
user: How many positive integers $k$ are there such that \[\dfrac k{2013}(a+b)=lcm(a,b)\] has a solution in positive integers $(a,b)$?
Answer: 1006