To find P(X > Y), we need to sum up the probabilities of all the cases where X is greater than Y. These cases are (1,2), (1,3), (1,4), (2,3), and (2,4). So,
P(X > Y) = f(1,2) + f(1,3) + f(1,4) + f(2,3) + f(2,4)
= 1/8 + 1/8 + 1/8 + 1/8 + 1/8
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