# Find the sum upto n terms of the G.P. √7,√21,3√7,.......

## Answers

Answered by

9

Hello Keesan

The given GP is √7,√21,3√7,.......

the common ratio of the GP is(√21/√7)=√3

we know that the sum of first n terms of the GP with first term a and common ratio r is

so the sum of GP is

Hope it helps.

The given GP is √7,√21,3√7,.......

the common ratio of the GP is(√21/√7)=√3

we know that the sum of first n terms of the GP with first term a and common ratio r is

so the sum of GP is

Hope it helps.

Answered by

0

a=√7 r= √21/√7 = √3 >1

Sn = a( rn - 1) / r-1

= √7 [ (√3)n - 1]/ √3-1

= √7 ( √3+1) [(√3)n - 1 / 2

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