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OpenStudy (anonymous):
What is the sum of a 12–term arithmetic sequence where the last term is 13 and the common difference is –10? a) 605 b) 660 c) 748 d) 816
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OpenStudy (anonymous):
If last term is 13,terms should be 13,23,33,43,53,63,73,83,93,103,113 and 123.And sum of these terms are 816. So answer is d)816
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