Given that two discrete random variables X and Y follow the joint pdf pX,Y(x, y) = k(x

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Given that two discrete random variables X and Y follow the joint pdf pX,Y(x, y) = k(x + y), for x = 1, 2, 3 and y = 1, 2, 3,
(a) Find k.
(b) Evaluate pY|x(1) for all values of x for which px(x) > 0.
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