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4. Find k for which the function given by f(x, y) = P(X = x, Y = y) = kxy, for x = 1, 2, 3; y = 1,2,3, can serve as a joint p

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A ك - E for above to be valid: E E Pcm,y) = 1 E pcn,y) = kx [ix (1+2+3)+2 x (1+2+3)+3x[1+2+] =kX36 KX36 =1 K = 1/36 F(2,2) =

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