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OpenStudy (rainbow_dash):
The first term of a geometric series is -1, and the common ratio is -3. How many terms are in the series if its sum is 182?
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OpenStudy (anonymous):
Partial sum to the nth term is: \[\frac{ a(1-r ^{n} )}{ 1-r}\]
OpenStudy (anonymous):
plug in your givens and solve for n
OpenStudy (rainbow_dash):
okay thanks!
OpenStudy (anonymous):
sure:)
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