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OpenStudy (anonymous):
What is the sum of a 23–term arithmetic sequence where the first term is 9 and the last term is 185?
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OpenStudy (anonymous):
use the gauss formula\[s=\frac{n}{2}(a _{1}+a _{n})\]\[s=\frac{23}{2}(9+185)=2231\]
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