Question

# The sum of first 8 terms of the series 3, 6, 12, 24,… is

A
452
B
541
C
689
D
765

Solution

## The correct option is D 765Clearly, the given series in G.P. Here a=3, r=2>1 and n=8 Sn=a(rn−1)(r−1)  S8=3×(28−1)(2−1)    =3×(256−1)    =765

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