Correct Answer: Option B

Explanation

3 + 6 + 12 + .....18thy term

1st term = 3, common ratio \(\frac{6}{3}\) = 2

n = 18, sum of GP is given by Sn = a\(\frac{(r^n - 1)}{r - 1}\)

s18 = 3\(\frac{(2^{18} - 1)}{2 - 1}\)

= 3(2^18 - 1)

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