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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?
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OpenStudy (experimentx):
110+13 = 123 ... that will be your first term.
OpenStudy (experimentx):
and the sum will be 12/2 x (first term + last term) = 6 x (123+13)
OpenStudy (anonymous):
got ittt !!! :) 816!!!
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