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2003 AIME II Problems

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2003 AIME II (Answer Key)
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Instructions

  1. This is a 15-question, 3-hour examination. All answers are integers ranging from 000 to 999, inclusive. Your score will be the number of correct answers; i.e., there is neither partial credit nor a penalty for wrong answers.
  2. No aids other than scratch paper, graph paper, ruler, compass, and protractor are permitted. In particular, calculators are not permitted.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Contents

Problem 1

The product N of three positive integers is 6 times their sum, and one of the integers is the sum of the other two. Find the sum of all possible values of N.

Solution

Problem 2

Let N be the greastest integer multiple of 8, no two whose digits are the same. What is the remainder when N is divided by 1000.

Solution

Problem 3

Define a good~word as a sequence of letters that consists only of the letters A, B, and C - some of these letters may not appear in the sequence - and in which A is never immediately followed by B, B is never immediately followed by C, and C is never immediately followed by A. How many seven-letter good words are there?

Solution

Problem 4

In a regular tetrahedron the centers of the four faces are the vertices of a smaller tetrahedron. The ratio of the volume of the smaller tetrahedron to that of the larger is m/n, where m and n are relatively prime positive integers. Find m+n.

Solution

Problem 5

A cylindrical log has diameter 12 inches. A wedge is cut from the log by making two planar cuts that go entirely through the log. The first is perpendicular to the axis of the cylinder, and the plane of the second cut forms a 45^\circ angle with the plane of the first cut. The intersection of these two planes has exactly one point in common with the log. The number of cubic inches in the wedge can be expressed as n\pi, where n is a positive integer. Find n.

Solution

Problem 6

In triangle ABC, AB = 13, BC = 14, AC = 15, and point G is the intersection of the medians. Points A', B', and C', are the images of A, B, and C, respectively, after a 180^\circ rotation about G. What is the area of the union of the two regions enclosed by the triangles ABC and A'B'C'?

Solution

Problem 7

Find the area of rhombus ABCD given that the radii of the circles circumscribed around triangles ABD and ACD are 12.5 and 25, respectively.

Solution

Problem 8

Find the eighth term of the sequence 1440, 1716, 1848,\ldots, whose terms are formed by multiplying the corresponding terms of two arithmetic sequences.

Solution

Problem 9

Consider the polynomials P(x) = x^{6} - x^{5} - x^{3} - x^{2} - x and Q(x) = x^{4} - x^{3} - x^{2} - 1. Given that z_{1},z_{2},z_{3}, and z_{4} are the roots of Q(x) = 0, find P(z_{1}) + P(z_{2}) + P(z_{3}) + P(z_{4}).

Solution

Problem 10

Two positive integers differ by 60. The sum of their square roots is the square root of an integer that is not a perfect square. What is the maximum possible sum of the two integers?

Solution

Problem 11

Triangle ABC is a right triangle with AC = 7, BC = 24, and right angle at C. Point M is the midpoint of AB, and D is on the same side of line AB as C so that AD = BD = 15. Given that the area of triangle CDM may be expressed as \frac {m\sqrt {n}}{p}, where m, n, and p are positive integers, m and p are relatively prime, and n is not divisible by the square of any prime, find m + n + p.

Solution

Problem 12

The members of a distinguished committee were choosing a president, and each member gave one vote to one of the 27 candidates. For each candidate, the exact percentage of votes the candidate got was smaller by at least 1 than the number of votes for that candidate. What is the smallest possible number of members of the committee?

Solution

Problem 13

A bug starts at a vertex of an equilateral triangle. On each move, it randomly selects one of the two vertices where it is not currently located, and crawls along a side of the triangle to that vertex. Given that the probability that the bug moves to its starting vertex on its tenth move is m/n, where m and n are relatively prime positive integers, find m + n.

Solution

Problem 14

Let A = (0,0) and B = (b,2) be points on the coordinate plane. Let ABCDEF be a convex equilateral hexagon such that \angle FAB = 120^\circ, \overline{AB}\parallel \overline{DE}, \overline{BC}\parallel \overline{EF,} \overline{CD}\parallel \overline{FA}, and the y-coordinates of its vertices are distinct elements of the set \{0,2,4,6,8,10\}. The area of the hexagon can be written in the form m\sqrt {n}, where m and n are positive integers and n is not divisible by the square of any prime. Find m + n.

Solution

Problem 15

Let

P(x) = 24x^{24} + \sum_{j = 1}^{23}(24 - j)(x^{24 - j} + x^{24 + j}).

Let z_{1},z_{2},\ldots,z_{r} be the distinct zeros of P(x), and let z_{K}^{2} = a_{k} + b_{k}i for k = 1,2,\ldots,r, where i = \sqrt { - 1}, and a_{k} and b_{k} are real numbers. Let

\sum_{k = 1}^{r}|b_{k}| = m + n\sqrt {p},

where m, n, and p are integers and p is not divisible by the square of any prime. Find m + n + p.

Solution

See also

Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.
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