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2. Let {0 p(x, y) otherwise (a) Find c so that p(x, y) defines a valid (joint) probability mass function. That is, find the

2. Let {0 p(x, y) otherwise (a) Find c so that p(x, y) defines a valid (joint) probability mass function. That is, find the value of c so (b) Find E[XY] E E

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