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OpenStudy (anonymous):
Find Sn for the given geometric series. a1=0.15, a5=614.4, r=8
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OpenStudy (anonymous):
Wikipedia shows a decent derivation of the formula: http://en.wikipedia.org/wiki/Geometric_series#Sum
OpenStudy (anonymous):
Since r>1 \[Sn=\frac{ a(r^n-1) }{ r-1 }\]
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