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Mathematics 21 Online
OpenStudy (anonymous):

What is the sum of a 17-term arithmetic sequence where the first term is 8 and the last term is -88? -542 -680 -893 -954

OpenStudy (anonymous):

\[Sum={n(a_1+a_{17})/2}=17(8-88)/2=17*(-80)/2=-680\]

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