A friend of mine tossed a fair coin twice. Suppose instead that I happen to see the result of one of his tosses, and it is a head. What is the probability that the other toss is tail?
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This is the same as your other question (http://math.stackexchange.com/questions/299500/coin-toss-probability-of-a-tail-known-that-one-is-heads) if you don't know which of the two tosses you saw - the first or the second. If you know which toss you saw, then the probability is $1/2$ – Paresh Feb 10 '13 at 17:26