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OpenStudy (anonymous):
Find the indicated sum of the geometric series.
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OpenStudy (anonymous):
\[\sum_{k=1}^{6} -3\left( 2 \right)^{k-1}\]
OpenStudy (amistre64):
\[S_n=a_1\frac{1-r^n}{1-r}\]
OpenStudy (anonymous):
what would be r?
OpenStudy (amistre64):
r is what is being powered up in the setup ... so, 2
OpenStudy (anonymous):
ohhhh ok
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OpenStudy (amistre64):
\[S_6=-3\frac{1-2^6}{1-2}\]
OpenStudy (anonymous):
-189?
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