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What is the sum of an 8–term geometric series if the first term is –11, the last term is 859,375, and the common ratio is –5?
–143,231
716,144
144,177
–36,047
 2 years ago
 2 years ago
What is the sum of an 8–term geometric series if the first term is –11, the last term is 859,375, and the common ratio is –5? –143,231 716,144 144,177 –36,047
 2 years ago
 2 years ago

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Tomas.ABest ResponseYou've already chosen the best response.2
what formula you used? \[S=a\frac{1r^n}{1r}\] this?
 2 years ago

mitosukiBest ResponseYou've already chosen the best response.2
No it looks like: a1  a1 (r)^n Sn = _______________ 1  r
 2 years ago

Tomas.ABest ResponseYou've already chosen the best response.2
i calculated wrongly, you are correct, sorry
 2 years ago

mitosukiBest ResponseYou've already chosen the best response.2
Haha it's ok, thank you
 2 years ago

Tomas.ABest ResponseYou've already chosen the best response.2
i calculated as \[S=a\frac{r^n1}{1r}\] mixed r^n and 1 ><
 2 years ago
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