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If p is the probability for a success and q (1 – p) the probability for a failure, the probability for the first success to occur at the kth trial will be (where x = k) P(x) = p(1 – p)x-1, x = 1, 2, 3, … The probability that more than n trials are needed before the first success will be . P(k > n) = qn = (1 – p)n. Geometric PDF ................
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