Joint probability distributions of the random variables
Determine the values of c so that the following functions represent joint probability distributions of the random variables A" and Y:
a) f(x, y) - cxy, for x = 1, 2, 3; y = 1, 2, 3;
b) f(x, y) = cx - y, for x = - 2, 0, 2; y = - 2, 3.
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