18. (a) Show that p(n) = 1 n(n + 1) , n 1, is a probability...

Question:

18.

(a) Show that p(n) = 1 n(n + 1) , n ≥ 1, is a probability mass function.

(b) Let X be a random variable with probability mass function p given in part (a); find E(X).

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