Question: 21. In testing a relay, suppose that the probability is p that it fails to make satisfactory contact in a single trial and that p
21. In testing a relay, suppose that the probability is p that it fails to make satisfactory contact in a single trial and that p remains unchanged over a very large number of trials. By assuming the outcomes of successive trials to be independent, what is the probability that
(a) x trials have to be made to obtain the first failure?
(b) x trials have to be made to obtain the kth failure?
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