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September 2, 2015

Homework Help: math

Posted by Poppy on Sunday, December 18, 2011 at 7:34pm.

the ninth term of an arithmetic sequence is 23 and the 33rd term of the sequence is -241 , calculate the sume of the first 15 terms of the sequence , using the formula

s=n(2a+(n-1)d)/2

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