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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

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.Letrrepresent the probability that at least four phone calls are required to produce one completed survey. Determine the probability that at least twelve calls are required given that at least four calls are required. Identify the distribution from the scenario along with parameters. Identify any property used. Simplify the answer.

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