Difference between revisions of "2019 AIME II Problems"
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==Problem 9== | ==Problem 9== | ||
+ | Call a positive integer <math>n</math> <math>k-pretty</math> if <math>n</math> has exactly <math>k</math> positive divisors and <math>n</math> is divisible by <math>k</math>. For example, <math>18</math> is <math>6</math>-pretty. Let <math>S</math> be the sum of the positive integers less than <math>2019</math> that are <math>20</math>-pretty. Find <math>\tfrac{S}{20}</math>. | ||
[[2019 AIME II Problems/Problem 9 | Solution]] | [[2019 AIME II Problems/Problem 9 | Solution]] |
Revision as of 15:57, 22 March 2019
2019 AIME II (Answer Key) | AoPS Contest Collections • PDF | ||
Instructions
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Contents
[hide]Problem 1
Two different points, and , lie on the same side of line so that and are congruent with , and . The intersection of these two triangular regions has area , where and are relatively prime positive integers. Find .
Problem 2
Lily pads lie in a row on a pond. A frog makes a sequence of jumps starting on pad . From any pad the frog jumps to either pad or pad chosen randomly with probability and independently of other jumps. The probability that the frog visits pad is , where and are relatively prime positive integers. Find .
Problem 3
Find the number of -tuples of positive integers that satisfy the following system of equations:
Problem 4
A standard six-sided fair die is rolled four times. The probability that the product of all four numbers rolled is a perfect square is , where and are relatively prime positive integers. Find .
Problem 5
Four ambassadors and one advisor for each of then are to be seated at a round table with chairs numbered in order to . Each ambassador must sit in an even-numbered chair. Each advisor must sit in a chair adjacent to his or her ambassador. There are ways for the people to be seated at the table under these conditions. Find the remainder when is divided by .
Problem 6
In a Martian civilization, all logarithms whose bases are not specified as assumed to be base , for some fixed . A Martian student writes down and finds that this system of equations has a single real number solution . Find .
Problem 7
Triangle has side lengths , and . Lines , and are drawn parallel to , and , respectively, such that the intersections of , and with the interior of are segments of lengths , and , respectively. Find the perimeter of the triangle whose sides lie on lines , and .
Problem 8
The polynomial has real coefficients not exceeding and . Find the remainder when is divided by .
Problem 9
Call a positive integer if has exactly positive divisors and is divisible by . For example, is -pretty. Let be the sum of the positive integers less than that are -pretty. Find .
Problem 10
Problem 11
Problem 12
Problem 13
Problem 14
Problem 15
2019 AIME II (Problems • Answer Key • Resources) | ||
Preceded by 2019 AIME I |
Followed by 2020 AIME I | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 | ||
All AIME Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.