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.

-1, k and -1 are three consecutive terms of a G.P., then

(i) k = 1

(ii) k = -1

Which of the following is valid ?

1. only 1

2. only 2

3. both 1 and 2

4. either 1 or -1