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Let X1 and X2 be two Poisson random variables. Suppose is distributed as Poisson(A1), and X2 is distributed as Poisson (2), where A1, A2

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Let X1 and X2 be two Poisson random variables. Suppose is distributed as Poisson(A1), and X2 is distributed as Poisson (2), where A1, A2 > 0. Suppose X1 and X2 are independent. Let Y = X1+X2. What is the distribution of Y? Hint: The moment generating function of Poisson(A) is exp (\(et - 1)).

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