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1. (10 points) Let X1 and X2 have the joint p.m.f. f(x1, (2) = X1 2 36 , 1 = 1, 2, 3; x2 =

1. (10 points) Let X1 and X2 have the joint p.m.f. f(x1, (2) = X1 2 36 , 1 = 1, 2, 3; x2 = 1, 2,3. (a) Find the joint p.m.f. of Y1 = X1X2 and Y2 = X2. (b) Find the marginal p.m.f. of Y1

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