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OpenStudy (anonymous):
Please help! 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 (anonymous):
Use the formula I have given to u
OpenStudy (anonymous):
Your last response didn't show up :/
OpenStudy (anonymous):
9837=a(r^(n)-1)/n-1
OpenStudy (anonymous):
plug r=3 and a=9 to get n
OpenStudy (anonymous):
sorry r-1 in the denominator
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OpenStudy (anonymous):
see, my brain isnot working
OpenStudy (anonymous):
Thanks! :D
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