Let X1 be a Binomial random variable with n = 5 and p = 0.1. Let X2 be a binomial random variable with n = 8 and p = 0.1. If X1 and X2 are independent

Let X1 be a Binomial random variable with n = 5 and p = 0.1. Let X2 be a binomial random variable with n = 8 and p = 0.1. If X1 and X2 are independent, find the joint probability distribution function of Y1 = X1 + X2 and Y2 = X1 ? X2.

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