# Question

Let X1 and X2 be independent random variables with respective binomial distributions b(3, 1/2) and b(5, 1/2). Determine

(a) P(X1 = 2, X2 = 4).

(b) P(X1 + X2 = 7).

(a) P(X1 = 2, X2 = 4).

(b) P(X1 + X2 = 7).

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