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OpenStudy (anonymous):
Find S[n], for the given arithmetic series. a[1] = 22, d = -8, n = 21
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OpenStudy (kamille):
You can use formula \[S=\frac{ (a _{1}+a _{n})n }{ 2 }\] Do you know how to find a_{n}?
OpenStudy (kamille):
or another formula
OpenStudy (kamille):
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