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Mathematics, 04.05.2021 19:40 tayleeanntabeln2097

Suppose that X and Y are integer valued random variables with joint probability mass function given by PX, Y(a, b) = {1/4a, for 1 <= b <= a <= 4
0 otherwise.

a. Show that this is indeed a joint probability mass function.
b. Find the marginal probability mass function of X and Y.
c. Find P(X = Y + 1).

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