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need perfect answer with correct steps Let X and Y be two random variables whose joint pdf is given by fx.y(x, y) = 4e-2(x+>), 1>0,y>0.

need perfect answer with correct steps

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Let X and Y be two random variables whose joint pdf is given by fx.y(x, y) = 4e-2(x+>), 1>0,y>0. (a) Find the edf of Z = X + Y. (b) Find the joint pdf of U = X/Y and V = X. (c) Find the marginal pdf of U = X/Y

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