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OpenStudy (anonymous):
Please help! Problem on arithmetic series. Attachment below.
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OpenStudy (anonymous):
I'm not sure how I'd set this up, and I don't know what formula I'd use. Can someone help?
OpenStudy (anonymous):
\[S_n=\frac{n}{2}(a_1+a_n)\]
OpenStudy (anonymous):
Thanks!
OpenStudy (anonymous):
\[360=\frac{n}{2}(42-26)\]solve for \(n\)
OpenStudy (anonymous):
yw
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