olymmath

AIME 2003b

American Invitational Mathematics Examination 2003.

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Problem 1

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The product NN of three positive integers is 66 times their sum, and one of the integers is the sum of the other two. Find the sum of all possible values of NN.

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Problem 2

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

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Problem 3

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Define a good word\text{good~word} as a sequence of letters that consists only of the letters AA, BB, and CC - some of these letters may not appear in the sequence - and in which AA is never immediately followed by BB, BB is never immediately followed by CC, and CC is never immediately followed by AA. How many seven-letter good words are there?

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Problem 4

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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/nm/n, where mm and nn are relatively prime positive integers. Find m+nm+n.

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Problem 5

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A cylindrical log has diameter 1212 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∘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 nπn\pi, where n is a positive integer. Find nn.

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Problem 6

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

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Problem 7

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Find the area of rhombus ABCDABCD given that the circumradii of triangles ABDABD and ACDACD are 12.512.5 and 2525, respectively.

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Problem 8

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

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Problem 9

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Consider the polynomials P(x)=x6−x5−x3−x2−xP(x) = x^{6} - x^{5} - x^{3} - x^{2} - x and Q(x)=x4−x3−x2−1.Q(x) = x^{4} - x^{3} - x^{2} - 1. Given that z1,z2,z3,z_{1},z_{2},z_{3}, and z4z_{4} are the roots of Q(x)=0,Q(x) = 0, find P(z1)+P(z2)+P(z3)+P(z4).P(z_{1}) + P(z_{2}) + P(z_{3}) + P(z_{4}).

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Problem 10

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Two positive integers differ by 6060. 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?

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Problem 11

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

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Problem 12

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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 was the smallest possible number of members of the committee?

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Problem 13

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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,m/n, where mm and nn are relatively prime positive integers, find m+n.m + n.

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Problem 14

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

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Problem 15

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Let P(x)=24x24+∑j=123(24−j)(x24−j+x24+j).P(x) = 24x^{24} + \sum_{j = 1}^{23}(24 - j)(x^{24 - j} + x^{24 + j}). Let z1,z2,…,zrz_{1},z_{2},\ldots,z_{r} be the distinct zeros of P(x),P(x), and let zk2=ak+bkiz_{k}^{2} = a_{k} + b_{k}i for k=1,2,…,r,k = 1,2,\ldots,r, where aka_{k} and bkb_{k} are real numbers. Let where m,n,m, n, and pp are integers and pp is not divisible by the square of any prime. Find m+n+p.m + n + p.

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