Question: Let X be chosen at random from the set {1, 2, 3, 4, 5}. Once X is chosen, then Y is chosen at random from

Let X be chosen at random from the set {1, 2, 3, 4, 5}. Once X is chosen, then Y is chosen at random from the set {1, 2, ..., X}. (For example, if X = 3 then Y is chosen from the set {1, 2, 3})

Find the joint mass function of X and Y

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