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Question
Find the sum of 6 terms of the series 2 + 6 + 18 + .....
Sum
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Solution
a = 2
r = 3
n = 6
Sum of n terms of the GP
Sn = `(a(r^n - 1))/(r - 1)`
S6 = `(2(3^6 - 1))/2`
= 729 − 1
= 728
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