Problem 5: Let X, and X, be two random variables with joint probability mass function X₂ p(x1, x2)=6 G*** for 1≤x; <∞, i=1,2, where x, and x, are integers, zero elsewhere. Determine the joint moment generating function (mgf) of X, and X₂. Then find the mgf of X₁ + X₂.

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