Find the sum of the sequence -1/3, 1, -3, 9, ........ upto 8 terms.

Common ratio = . Since, |r| 1 Hence, sum =

The first two terms of a G.P. are 125 and 25 respectively. Find the 5^th and the 6^th terms of the G.P.

Find a G.P. for which the sum of first two terms is -4 and the fifth term is 4 times the third term.