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A geometric series has a second term of −43 and a fifth term of 3281.Find the sum of the first 10 terms

 Oct 3, 2020
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-43 =F * R,   
3281 =F * R^4, solve for F, R

 

F = 43 (43/3281)^(1/3) - First Term 
R = -(3281/43)^(1/3) - Common Ratio.

 

Sum =(F * [(1 - R^N) / (1 - R)] =-3,644,446.06

 Oct 3, 2020

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