Problem

2010 AIME II Problem 2

A point P is chosen at random in the interior of a unit square S. Let d(P) denote the distance from P to the closest side of S. The probability that \frac{1}{5}\le d(P)\le\frac{1}{3} is equal to \frac{m}{n}, where m and n are relatively prime positive integers. Find m+n.

Leading zeroes must be inputted, so if your answer is 34, then input 034


Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.


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Problem Tags: Counting and probability Number theory

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