Suppose that four trials are performed with probability of success on ith trial being 1/i then expected value of the total number of success

Suppose that four trials are performed with probability of success on ith trial being 1/i; i belongs to [1,4] then expected value of the total number of success is:

(a) 25/12 (b) 31/12 (c) None of these (d) 3/2

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