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HMMT 2012 U16

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Let A,B,CA, B, C, and DD be points randomly selected independently and uniformly within the unit square. What is the probability that the six lines AB‾,AC‾,AD‾,BC‾,BD‾\overline{A B}, \overline{A C}, \overline{A D}, \overline{B C}, \overline{B D}, and CD‾\overline{C D} all have positive slope?

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{1}{24}

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