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OpenStudy (anonymous):
What is the formula for finding the sum of an arithmetic series? What must you substitute into this formula if you do NOT know the last term of the sequence (an)?
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hartnn (hartnn):
same as your last Q! \(S_n = n/2 (a_1 + a_n) \) and for 2nd part, substitute, \(a_n=a_1+(n−1)d \)
OpenStudy (anonymous):
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