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Feb 4, 2015 at 6:29 comment added Robert Israel $P(|X-Y|=z) = P(X-Y=z) + P(X-Y=-z)$ for nonnegative integers $z$.
Feb 4, 2015 at 6:17 comment added Erel Segal-Halevi This explains the distribution of X−Y (in the special case). How do you get from it to the distribution of |X-Y|?
Nov 11, 2013 at 7:06 history answered Robert Israel CC BY-SA 3.0