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OpenStudy (anonymous):
What is the sum of a 17-term arithmetic sequence where the first term is 6 and the last term is -90? -813 -790 -765 -714
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jimthompson5910 (jim_thompson5910):
hint: use the formula S = n*(a1 + an)/2
jimthompson5910 (jim_thompson5910):
S = sum n = number of terms a1 = first term an = nth term
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