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OpenStudy (anonymous):
What is the sum of a 17-term arithmetic sequence where the first term is 9 and the last term is -87?
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OpenStudy (anonymous):
use the general formula of summation of an arithmetic series
OpenStudy (espex):
S_n = 1/2 n(a_1 + a_n)
OpenStudy (espex):
S_n = a_1 + d(a_n-1) is the other form I believe.
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