What is the sum of a 7-term geometric series if the first term is −11, the last term is −171,875, and the common ratio is −5? −143,231 −36,047 144,177 716,144

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What is the sum of a 7-term geometric series if the first term is −11, the last term is −171,875, and the common ratio is −5? −143,231 −36,047 144,177 716,144

Mathematics
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  • phi
the formula for the sum of a geometric series is \[ \sum_{i=0}^n a\ r^i=a \frac{1-r^{n+1}}{1-r} \] where a is the first term, r is the common ratio, and in your case, n is 6

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