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OpenStudy (anonymous):
What is the sum of the geometric sequence 1, 3, 9, … if there are 14 terms?
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OpenStudy (anonymous):
\[a+ar+ar^2+...+ar^n=a\frac{r^{n+1}-1}{r-1}\]
OpenStudy (anonymous):
in your example \(a=1,r=3, n=13\)
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