2. Let the joint pmf of X and Y be defined by f (x, y) = , x = 1, 2, y = 1, 2, 3, 4. (a) Find fx(x), the marginal pmf of X. (b) Find fy (y), the marginal pmf of Y. (c) Find P(X >Y).

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A: our objective is to find the required derivative

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