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

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.

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