Home
Class 11
MATHS
In a geometric series, the first term is...

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 ,t h e nr S_n+(1+=-r)U_n` equals `0` b. `n` c. `n a` d. `n a r`

Promotional Banner

Similar Questions

Explore conceptually related problems

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

S_(n) denote the sum of the first n terms of an A.P. If S_(2n)=3S_(n) , then S_(3n):S_(n) is equal to

If S_(n), denotes the sum of n terms of an AP, then the value of (S_(2n)-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

S_(r) denotes the sum of the first r terms of an AP.Then S_(3d):(S_(2n)-S_(n)) is -

Let S_(n) denote the sum of first n terms of an A.P.If S_(2n)=3S_(n), then find the ratio S_(3n)/S_(n)