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OpenStudy (anonymous):
What is the sum of a 22–term arithmetic sequence where the first term is 54 and the last term is –30?
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OpenStudy (anonymous):
i'll give you a medal!
OpenStudy (nenadmatematika):
Sn=n/2*(a1+an) so I think the sum is \[22/2\times(54-30)=264\]
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