Find the sum of the first five terms of the G.P 2,6, 18 ....
Find the sum of the first five terms of the G.P 2,6, 18 ....
484
243
242
130
121
Correct answer is C
\(S_{n} = \frac{a(r^n - 1)}{r - 1}\)
a = 2; r = 6/2 = 3.
\(S_{5} = \frac{2(3^5 - 1)}{3 - 1}\)
= \(243 - 1 = 242\)
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