Images N 1 PROBLEM

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N 1 problem. (N+1)!/N!. 2n+1. N(N-1)/2. Sum((n^2*x^n)/((4^n*(n + 2))), (n, 1, oo)).
(N+1)!/N!. 2n+1. N(N-1)/2. Sum((n^2*x^n)/((4^n*(n + 2))), (n, 1, oo)).

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