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Consider a sequence of independent Bernoulli trials with p _ 0.2. (a) What is the expected number of trials to obtain the first success? (b)

Consider a sequence of independent Bernoulli trials with p _ 0.2.
(a) What is the expected number of trials to obtain the first success?
(b) After the eighth success occurs, what is the expected number of trials to obtain the ninth success?

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