Find the sum of indicated terms of the following geometric progressions.  0.15, 0.015, 0.0015, …..; 20 terms.

37

(a) a = , r = 3/ =
(b) a = , r =

38

For what values of x, the numbers , x, are in G.P?

40

Find the sum of indicated terms of the following geometric progressions. , , 3, ….; n terms.

41

Find the sum of indicated terms of the following geometric progressions. 1, -a, a², -a³, ….; n terms. (a  -1)