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

38

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

39

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

41

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

42

Find the sum of indicated terms of the following geometric progressions.  x³, x⁵, x⁷, ….; n terms. (x ≠ ±1)