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OpenStudy (anonymous):
Find S8 for the series -2 + -10 + -50 + -250
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Miracrown (miracrown):
Here is a good example that would help you a lot! http://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.398922.html
OpenStudy (anonymous):
wowww @Miracrown u sooo smart, it works Sn = (a*(1-r^n)) / (1-r) a = -2 r = 5 n = 8 S8 = -1953??
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