Date: Fri, 22 Nov 1996 17:42:33 -0500
From: Alex Bogomolny
The simplest way is to first compute the probability that 'A' will not be selected. For a single rep display, this probability is (x-1)/x. For two reps display, it's [(x-1)/x]2. For n reps display, it's [(x-1)/x]n. Therefore, the probability that 'A' will show up at least once is 1-[(x-1)/x]n.
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