Question: Two integers are randomly selected from the set {1, 2, 3, 4, 5, 6, 7, 8, 9} and are added together. Find the probability that

Two integers are randomly selected from the set {1, 2, 3, 4, 5, 6, 7, 8, 9} and are added together. Find the probability that their sum is

13

if they are selected(a) with replacement,(b) without replacement.

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