30. Let Xi,i 0 be independent and identically distributed random variables with probability mass function p(j)

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30. Let Xi,i  0 be independent and identically distributed random variables with probability mass function p(j) = P{Xi = j}, j = 1,..., m, m j=1 P(j) = 1 Find E[N], where N = min{n > 0 : Xn = X0}.

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