A G.P. has first term 729 and 7th term 64. Find the sum of its first 7 terms.

The first term of G.P. is 27 and 8th term is 1/81 . Find the sum of its first 10 terms.

If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms. OR Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.

If the first term of a GP is 729 and 7th term is 64, then the sum of its first seven terms is

The first term of a GP is 27 and its 8th terms is 1/81 . Find the sum of its first 10 terms.

The first term of a G.P. is 27 and its eight term is (1)/(81) . Find the sum of its first 10 terms.

If the first term of a G.P. is 729 and its 7^(th) term is 64, then the sum of first seven terms is

The sum of first 8 terms of an A.P. is 64 and that of first 15 terms is 225. Find the sum of its first 17 terms.

The sum of first 8 terms of an A.P. is 64 and that of first 15 terms is 225. Find the sum of its first 17 terms.

7th term of an A.P. is 40. then the sum of the first 13 terms is

The sum of first 7 terms of an A.P. is 49 and that of first 17 terms of it is 289. Find the sum of first n terms.