The fifth term of a G.P. is 81 whereas its second term is 24. Find the series and sum of its first eight terms.

If the sum of the first 9 terms of an A.P. is 81 and that of the first 18 terms is 324, find the sum of its first n terms.

The 12th term of an AP is -13 and the sum of its first four terms is 24. Find the sum of its first 10 terms.

The twelfth term of an A.P. is (-13) and the sum of its first four terms is 24, find the sum of first 12 terms of the A.P.

The sum of an infinite G.P. . Is 6 and its first term is 2 . Find the series

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 4 th term of a G.P.is square of its second term and the first term is -3. Find its 7 th term.

The sum of first three terms of a G.P. is 15 and sum of next three terms is 120. Find the sum of first n terms.

The second term of a GP is 24 and its fifth term is 81. Find the sum of its first five terms.

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

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