Find the sum of the sequence -1-3-1-3-9- upto 8 terms-

,n=8 So by S8= 1/3×1 ( 3)^8/1 ( 3) =546.66 ...

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Sum of n Terms

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Question

Find the sum of the sequence $- \frac{1}{3}, 1, - 3, 9,$ ............ upto 8 terms.

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