Mock AIME 3 Pre 2005 Problems

$1.$ Three circles are mutually externally tangent. Two of the circles have radii $3$ and $7$ . If the area of the triangle formed by connecting their centers is $84$ , then the area of the third circle is $k\pi$ for some integer $k$ . Determine $k$ .

$2.$ Let $N$ denote the number of $7$ digit positive integers have the property that their digits are in increasing order. Determine the remainder obtained when $N$ is divided by $1000$ . (Repeated digits are allowed.)

$3.$ A function $f(x)$ is defined for all real numbers $x$ . For all non-zero values $x$ , we have

$2f\left(x\right) + f\left(\frac{1}{x}\right) = 5x + 4$

Let $S$ denote the sum of all of the values of $x$ for which $f(x) = 2004$ . Compute the integer nearest to $S$ .

$4.$ $\zeta_1, \zeta_2,$ and $\zeta_3$ are complex numbers such that

$\zeta_1 + \zeta_2 + \zeta_3 = 1$

$\zeta_1^{2} + \zeta_2^{2} + \zeta_3^{2} = 3$

$\zeta_1^{3} + \zeta_2^{3} + \zeta_3^{3} = 7$

Compute $\zeta_1^{7} + \zeta_2^{7} + \zeta_3^{7}$ .

$5.$ In Zuminglish, all words consist only of the letters $M, O,$ and $P$ . As in English, $O$ is said to be a vowel and $M$ and $P$ are consonants. A string of $M's, O's,$ and $P's$ is a word in Zuminglish if and only if between any two $O's$ there appear at least two consonants. Let $N$ denote the number of $10$ -letter Zuminglish words. Determine the remainder obtained when $N$ is divided by $1000$ .

$6.$ Let $S$ denote the value of the sum

$\sum_{n = 1}^{9800} \frac{1}{\sqrt{n + \sqrt{n^2 - 1}}}$

$S$ can be expressed as $p + q \sqrt{r}$ , where $p, q,$ and $r$ are positive integers and $r$ is not divisible by the square of any prime. Determine $p + q + r$ .

$7.$ $ABCD$ is a cyclic quadrilateral that has an inscribed circle. The diagonals of $ABCD$ intersect at $P$ . If $AB = 1, CD = 4,$ and $BP : DP = 3 : 8,$ then the area of the inscribed circle of $ABCD$ can be expressed as $\frac{p\pi}{q}$ , where $p$ and $q$ are relatively prime positive integers. Determine $p + q$ .

$8.$ Let $N$ denote the number of $8$ -tuples $(a_1, a_2, \dots, a_8)$ of real numbers such that $a_1 = 10$ and

$\left|a_1^{2} - a_2^{2}\right| = 10$

$\left|a_2^{2} - a_3^{2}\right| = 20$

$\cdots$

$\left|a_7^{2} - a_8^{2}\right| = 70$

$\left|a_8^{2} - a_1^{2}\right| = 80$

Determine the remainder obtained when $N$ is divided by $1000$ .

$9.$ $ABC$ is an isosceles triangle with base $\overline{AB}$ . $D$ is a point on $\overline{AC}$ and $E$ is the point on the extension of $\overline{BD}$ past $D$ such that $\angle{BAE}$ is right. If $BD = 15, DE = 2,$ and $BC = 16$ , then $CD$ can be expressed as $\frac{m}{n}$ , where $m$ and $n$ are relatively prime positive integers. Determine $m + n$ .

$10.$ $\{A_n\}_{n \ge 1}$ is a sequence of positive integers such that

$a_{n} = 2a_{n-1} + n^2$

for all integers $n > 1$ . Compute the remainder obtained when $a_{2004}$ is divided by $1000$ if $a_1 = 1$ .

$11.$ $ABC$ is an acute triangle with perimeter $60$ . $D$ is a point on $\overline{BC}$ . The circumcircles of triangles $ABD$ and $ADC$ intersect $\overline{AC}$ and $\overline{AB}$ at $E$ and $F$ respectively such that $DE = 8$ and $DF = 7$ . If $\angle{EBC} \cong \angle{BCF}$ , then the value of $\frac{AE}{AF}$ can be expressed as $\frac{m}{n}$ , where $m$ and $n$ are relatively prime positive integers. Compute $m + n$ .

$12.$ Determine the number of integers $n$ such that $1 \le n \le 1000$ and $n^{12} - 1$ is divisible by $73$ .

$13.$ Let $S$ denote the value of the sum

$\left(\frac{2}{3}\right)^{2005} \cdot \sum_{k=1}^{2005} \frac{k^2}{2^k} \cdot {2005 \choose k}$

Determine the remainder obtained when $S$ is divided by $1000$ .

$14.$ Circles $\omega_1$ and $\omega_2$ are centered on opposite sides of line $l$ , and are both tangent to $l$ at $P$ . $\omega_3$ passes through $P$ , intersecting $l$ again at $Q$ . Let $A$ and $B$ be the intersections of $\omega_1$ and $\omega_3$ , and $\omega_2$ and $\omega_3$ respectively. $AP$ and $BP$ are extended past $P$ and intersect $\omega_2$ and $\omega_1$ at $C$ and $D$ respectively. If $AD = 3, AP = 6, DP = 4,$ and $PQ = 32$ , then the area of triangle $PBC$ can be expressed as $\frac{p\sqrt{q}}{r}$ , where $p, q,$ and $r$ are positive integers such that $p$ and $r$ are coprime and $q$ is not divisible by the square of any prime. Determine $p + q + r$ .

$15.$ Let $\Omega$ denote the value of the sum

$\sum_{k=1}^{40} \cos^{-1}\left(\frac{k^2 + k + 1}{\sqrt{k^4 + 2k^3 + 3k^2 + 2k + 2}}\right)$

The value of $\tan\left(\Omega\right)$ can be expressed as $\frac{m}{n}$ , where $m$ and $n$ are relatively prime positive integers. Compute $m + n$ .

Page

Toolbox

Search

Mock AIME 3 Pre 2005 Problems