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OpenStudy (anonymous):
find the sum of each arithmetic series. PART1: -15+ -3+9+21+33+45+57+69+81+93 STEP1: The formula for the sum of an arithmetic series is Sn=n/2(a1+an), where Sn is the sum of the terms in the series, n represents the number of the terms in the series, a1 is the first term in the series, and an is the nth term in the series. Find the value of the following a1=_____ an______ and n=_____
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