The random variables X and Y have the joint PMFpx,x (x, y) = { c • (•· (x + y)², if x = {1,2,4} and y = {1,3},otherwise.0, Find the PMF of X.Find the expectations E[X] and E[XY].Find the variance of X.

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A First Course in Probability (10th Edition)

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Chapter1: Combinatorial Analysis

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Find the PMF of X. Find the expectations E[X] and E[XY] Find the variance of X.