If S is the sum to infinite terms of a G.P whose first term is 'a', then the sum of the first n terms is

If S is the sum to infinite terms of a G.P.whose first term is 1. Then the sum of n terms is

If 2 is the sum to infinity of a G.P, whose first element is 1, then the sum of the first n terms is

The sum of the first n terms of an A.P.Whose first term pi is zero.The sum of the next m terms is:

Find the sum of an infinite G.P. whose first term is 28 and the second term is 4.

If the sum of sirst n terms of a G.P is p.sum of its first 2n terms is 3p,Prove that the sum of its first 3n terms is 7p.

if S_(n) denotes the sum of n terms of a G.P whose first term is a and common ratio is r then find the sum of S_(1),S_(3),S_(5).........,S_(2)n-1

If the sum of first n terms of G.P. is S and the sum of its first 2n terms is 5S, then show that the sum of its first 3n terms is 21S.

If the sum of first n terms of a G.P. is s and the sum of its first 2n terms is 5S, then show that the sum of its first 3n terms is 21S .

If the sum of first n terms of a G.P. is S and the sum of its first 2n terms is 5S, then show that the sum of its first 3n terms is 21S.