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Exercise 1. (Joint PMF) (25pt). Let the pmf of (X, Y) be given by PxY (x, y) 3 6/-0 0 0 (a) Find the marginal

Exercise 1. (Joint PMF) (25pt). Let the pmf of (X, Y) be given by PxY (x, y) 3 6/-0 0 0 (a) Find the marginal pmf of X. (Justify every step) (b) Find the marginal pmf of Y. (Justify every step) (c) Let A denote the event that X + Y

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