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OpenStudy (anonymous):
What is the sum of an 8-term geometric series if the first term is -11, the last term is 180,224, and the common ratio is -4
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OpenStudy (calculusfunctions):
First you will need to find the # of terms in the series. Then the sum of the geometric series is given by\[S _{n}=\frac{ a(r ^{n}-1) }{ r -1 }; r \neq 1\]
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