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What is the sum of the geometric series 2 plus 8 plus 14 plus 20 plus 26 and find S15?
Wiki User
∙ 11y ago
Looks more like an arithmetic series with a initial value of 2 and an increment of 6, thus
1st term = 2 + (6 x 0) = 2
2nd term = 2 + (6 x 1) = 8
3rd term = 2 + (6 x 2) = 14
4th term = 2 + (6 x 3) = 20
5th term = 2 + (6 x 4) = 26
....
....
15th term = 2 + (6 x 14) = 86
In general it is A1 + (n -1) x d
The sum is (n/2)(A1 + An) and in our case it is (15/2)(2 + 86) = (15 x 44) = 660
Wiki User
∙ 11y ago
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