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Question

The sum of first 10 terms of the G.P 3, 6, 12, 24,... is .
  1. 3500
  2. 3069
  3. 2059
  4. 4079


Solution

The correct option is B 3069

First term, a=3

Common ratio, r=2

Sum of n terms, Sn=a(rn1)r1

S10=a(r101)r1

=3(2101)21

=(10241)×3=3069

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