The first term of a geometric series is 3, and the sum of the first term and the second term is 15. What is the sum of the first six terms?

a) 1,023

b) 3,906

c) 4,095

d) 11,718

Question

3 October, 15:21

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Answers (1)

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Caylee Webb · Answer 1

Sum of n terms in a geometric progression is given by Sn = a1 (1 - r^n) / (1 - r)

3 (1 - 4^6) / (1-4)

= 4,095

The first term of a geometric series is 3, and the sum of the first term and the second term is 15. What is the sum of the first six terms?a) 1,023b) 3,906c) 4,095d) 11,718