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Mathematics 9 Online
OpenStudy (anonymous):

Arithmetic Series Sum Determine the sum of the arithmetic series. 5 + 8 + 11 + ... + 53. I know n/2(2t1 + (n-1 ) d) = Sn, but no matter how many times I try to solve this I get 4399. According to the answer key the correct answer is 493.

OpenStudy (wcrmelissa2001):

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