(Answered) Mr jones is waiting to make a phone call at a train station

Statistics

Mr. Jones is waiting to make a phone call at a train station. There are two public telephone booths next to each other, occupied by two persons, say A and B. If the duration of each telephone call is an exponential random variable with x = 1/8, what is the probability that among Mr. Jones, A, and B, Mr. Jones will not be the last to finish his call?

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