Find the sum of the first 18 terms of the progression 3, ...
Find the sum of the first 18 terms of the progression 3, 6, 12......
3(217 - 1)
3(218 - 1)
3(218 + 1)
3(217 - 1)
Correct answer is B
3 + 6 + 12 + .....18thy term
1st term = 3, common ratio 63 = 2
n = 18, sum of GP is given by Sn = a(rn−1)r−1
s18 = 3(218−1)2−1
= 3(2^18 - 1)
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