IIT JEE DROPPERS BATCH | BINOMIAL THEOREM | SUM OF SERIES WITH DOUBLE SIGMA

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Sum OF Special Series Containing ||Binomial Coefficients

Sum OF Special Series Containing Binomial Coefficients

In a geometric series , the first term is a and common ratio is r. If S_n denotes the sum of the n terms and U_n=Sigma_(n=1)^(n) S_n , then rS_n+(1-r)U_n equals