" If "S" is the sum to infinity 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 '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 'a', then the sum of the first 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

If S is the sum to infinity of a G.P, whose first element is a , then the sum of the first n elements 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

The sum to infinity of a G.P.is 4 times the first term.Then the common ratio

Find the common difference of an A.P. whose first term is 100 and the sum of whose first six terms is five times the sum of the next six terms.

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.

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: