Question: Continuation of Exercise 3-109. (a) What is the probability that you must call six times in order for two of your calls to be answered

Continuation of Exercise 3-109.
(a) What is the probability that you must call six times in order for two of your calls to be answered in less than 30 seconds?
(b) What is the mean number of calls to obtain two answers in less than 30 seconds?

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