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2011 AIME I Problems/Problem 10

Revision as of 13:34, 20 March 2011 by Thesquarerootof (talk | contribs) (Copied from AOPS)
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The probability that a set of three distinct vertices chosen at random from among the vertices of a regular n-gon determine an obtuse triangle is $\frac{93}{125}$ . Find the sum of all possible values of $n$.

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