SOLUTION: The given series has 6 terms. What is the sum of the terms in the series 5+8+11 . . +20

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Question 448455: The given series has 6 terms. What is the sum of the terms in the series 5+8+11 . . +20
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Arithmetic series/6 terms: {5,8,11,...20} highlight%28d=3%29

S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29

S%5B6%5D=%286%2F2%29%282%2A5%2B+5%2A3%29+=+highlight%2875%29