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Four points A_1, A_2, A_3, and A_4 are chosen at random on a circle. Find the probability that chords A_1 A_2 and A_3 A_4 intersect.

 Feb 14, 2020
edited by Guest  Feb 14, 2020
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Out of four ways, there is only one way to set up the chords A_1 A_2 and A_3 A_4 so that they intersect, so the probability is 1/4.

 Feb 14, 2020

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