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AHSME 1999 Problem 24

    Six points on a circle are given. Four of the chords joining pairs of the six points are selected at random. What is the probability that the four chords form a convex quadrilateral? (A) 115(B) 191(C) 1273(D) 1455(E) 11365\mathrm{(A) \ } \frac 1{15} \mathrm{(B) \ } \frac 1{91} \mathrm{(C) \ } \frac 1{273} \mathrm{(D) \ } \frac 1{455} \mathrm{(E) \ } \frac 1{1365}

    Dataset text NuminaMath-1.5. Quoted with source.

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    \frac{1}{91}

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