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OpenStudy (anonymous):
evaluate the sum:
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OpenStudy (anonymous):
\[\sum_{n=1}^{5} (3n+1)\]
OpenStudy (anonymous):
\[\sum_{n=1}^{8} 2n/3\]
OpenStudy (zzr0ck3r):
(3(1)+1) + (3(2) + 1) + (3(3) +1) + (3(4) + 1) + (3(5) + 1)
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