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Q23Section A (Section A)23 of 60

Variance from pmf recurrence relation

Let XX be a random variable having a probability mass function p(x)p(x) which is positive only for non-negative integers. If p(x+1)=(ln⁡3x+1)p(x),x=0,1,2,…,p(x+1) = \left(\frac{\ln 3}{x+1}\right) p(x),\quad x=0, 1, 2, \dots, then Var(X)\mathrm{Var}(X) equals

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