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OpenStudy (anonymous):
Find the sum of the geometric series, diagram in comments. Will medal/follow.
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OpenStudy (anonymous):
|dw:1407620703223:dw|
OpenStudy (anonymous):
that has to be the ugliest looking sigma i have seen all year
OpenStudy (anonymous):
\[\sum_{k=1}^nb^k=\frac{b^{n+1}-1}{b-1}\]
OpenStudy (anonymous):
oh wait i am off by one
OpenStudy (anonymous):
\[\frac{5^7-1}{5-1}-1\] is better
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OpenStudy (anonymous):
compute and you should get \(19530\)
OpenStudy (anonymous):
thanks
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