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Suppose that (X, Y )' has density 2 f(a, y) (1+xty)3> for x, y > 0, = 0 otherwise. Determine the distribution of (a) X

Suppose that (X, Y )' has density 2 f(a, y) (1+xty)3> for x, y > 0, = 0 otherwise. Determine the distribution of (a) X +Y. ( b) X - Y

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