Write the first three terms of the G.P. whose first term and the common ratio are given below.

(iii) a = 1000, r = 2/5

Solution :

First term (a) = 1000

Second term = ar = 1000(2/5) = 400

Third term = ar2 = 1000(2/5)2 = 1000(4/25) = 160

Hence the first three terms are 1000, 400, 160.