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If X and Y are independent random variables, show that the PDF of Z =X -Y is fz (z) = S_fy (y) fx(z + y)dy

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If X and Y are independent random variables, show that the PDF of Z =X -Y is fz (z) = S_fy (y) fx(z + y)dy (76) or fz (z) = S_fx (x) fy(x - z)dx (77)

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