202. A representative of a market research firm contacts consumers by phone in order to conduct surveys. The specific consumer contacted by each phone call is randomly determined. The probability that a phone call produces a completed survey is 0.25. Calculate the probability that more than three phone calls are required to produce one completed survey.
(A) 0.32
(B) 0.42
(C) 0.44
(D) 0.56
(E) 0.58

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題目解析 這道題目是一個經典的機率問題...
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