Question: 3. Let X1, X2, . . . , Xn be n independent exponential random variables with the identical mean 1/. Use moment-generating functions to find

3. Let X1, X2, . . . , Xn be n independent exponential random variables with the identical mean 1/λ. Use moment-generating functions to find the probability distribution function of X1 + X2 + · · · + Xn.

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