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OpenStudy (anonymous):
Help please??? Find S15 for the series 1 + 1.5 + 2.25 + 3.375 +...
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jimthompson5910 (jim_thompson5910):
first term: a = 1 common ratio: r = 1.5 plug this into \[\Large S = \frac{a*(1-r^n)}{1-r}\] n = 15 for the 15 terms you sum up
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