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OpenStudy (anonymous):
What is the sum of an 8-term geometric series if the first term is 13 and the last term is -3,639,168?
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OpenStudy (callisto):
common ratio of terms \[= \sqrt[7]{-3,639,168/13} = -6\] Sum of GS \[=\frac{a(r^n-1)}{r-1} =\frac{13((-6)^8-1)}{(-6)-1} = ? \]
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