. The sum of the first three terms of an increasing `G.P.` is `21 `and the sum of the their squaresis `189.` Then sum of its first `n` terms is

The sum of the first three terms of an increasing G.P. is 21 and the sum of their squares is 189. Then the sum of its first n terms is

The sum of the first three terms of an increasing G.P. is 21 and the sum of their squares is 189. Then the sum of its first n terms is

. The sum of the first three terms of an increesing G.P. is 21 and the sum of their squares is 189. Then the sum of its first n terms is

The sum of the first three terms of an increasing G.P.is 21 and the sum of their squares is 189. Then the sum of the first n terms is

The sum of the first three terms of a strictly increasing G.P. is alphas and sum of their squares is s^2

The sum of the first three terms of a strictly increasing G.P.is alpha s and sum of their squares is s^(2)

The sum of the first three terms of an arithmetic progression is 9 and the sum of their squares is 35. The sum of the first n terms of the series can be

The sum of the first three terms of an arithmetic progression is 9 and the sum of their squares is 35. The sum of the first n terms of the series can be

The sum of the first three terms of a G.P. is 21 and the sum of the next three terms is 168. Find the sum of first five terms.

The sum of the first three terms of an A.P. is 9 and the sum of their squares is 35. The sum to first n terms of the series can be