A woman makes long-distance calls with the help of her cell, Ask an Expert

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A woman makes long-distance calls with the help of her cell phone according to a Poisson process with rate λ. Suppose that for each long-distance call billed, the next call is free and that we fix the origin at the moment when a call has just been billed. Let N(t) be the number of calls billed in the interval (0,t].

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