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OpenStudy (starryknight):
Find the sum of the first 26 terms of the following sequence: 12, 18, 24 . . .
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OpenStudy (starryknight):
i got 2210 but idont know if its right or wrong
OpenStudy (kirbykirby):
Hmm I get 2262
OpenStudy (kirbykirby):
\[\large \sum_{n=0}^{25}(12+6n)=\sum_{n=1}^{26}(6+6n)=6(26)+6\frac{26(26+1)}{2} \]
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