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Question
Write the first three terms of the G.P. whose first term and the common ratio are given below
a = 6, r = 3
Solution
a = 6, r = 3
tn = arn-1
t1 = ar1-1 = ar0 = a = 6
t2 = ar2-1 = ar1 = 6 × 3 = 18
t3 = ar3-1 = ar2 = 6 × 32 = 54
∴ The 3 terms are 6, 18, 54, ….
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