olymmath

HMMT 2009 U25

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Four points, A,B,CA, B, C, and DD, are chosen randomly on the circumference of a circle with independent uniform probability. What is the expected number of sides of triangle ABCA B C for which the projection of DD onto the line containing the side lies between the two vertices?

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{3}{2}

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