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

In a geometric series, the first term is a and common ratio is rdot If S_n denotes the sum of the terms and U_n=sum_(n=1)^n S_n ,then r S_n+(1-r)U_n equals (a) 0 b. n c. n a d. n a r

In a geometric series, the first term is a and common ratio is rdot If S_n denotes the sum of the terms and U_n=sum_(n=1)^n S_n ,then r S_n+(1-r)U_n equals a. 0 b. n c. n a d. n a r

In a geometric series,the first term is a and common ratio is r. If S_(n) denotes the sum of the terms and U_(n)=sum_(n=1)^(n)S_(n), then rS_(n)+(1+=-r)U_(n) equals 0 b.n c.na d.nar

First term a and common ratio r = 1 then sum of n terms on G.P. is S_(n) = na .

If S_(n) denotes the sum of first n terms of an A.P. and S_(2n)= 3S_(n) , then (S_(3n))/(S_(n))=

If S_n denotes the sum of the first n terms of an AP and if S_2n=3S_n then S_3n:S_n is equal to

Let S_n denotes the sum of the first of n terms of A.P. and S_(2n)=3S_n . then the ratio S_(3n):S_n is equal to

Let S_(n) denotes the sum of the first of n terms of A.P.and S_(2n)=3S_(n). then the ratio S_(3n):S_(n) is equal to