1. Suppose that X1 and X2 are independent Poisson random variables with parameters 1 and 2, respectively....

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1. Suppose that X1 and X2 are independent Poisson random variables with parameters λ1 and λ2, respectively.

(a) Find the probability generating function of X1 + X2.

(b) What is the distribution of X1 + X2?

(c) What is the conditional distribution of X1 given that X1 + X2 = k?

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