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OpenStudy (anonymous):
A geometric series has a sum of 9,837. The common ratio is 3 and the first term is 9. How many terms are in the series?
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OpenStudy (dumbcow):
\[s _{n} = \frac{a(r^{n}-1)}{r-1}\] s = 9837 a = 9 r = 3 solve for n
OpenStudy (anonymous):
use the formula Sn = a * (r^n - 1)/ (r - 1) n = no. terms r = common ratio and a = ist term
OpenStudy (anonymous):
9?
OpenStudy (anonymous):
7
OpenStudy (anonymous):
dedfinitely 7 - sorry math must go
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