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Mathematics 13 Online
OpenStudy (anonymous):

What is the sum of the geometric sequence -1, 6, -36, ... if there are 7 terms?

OpenStudy (across):

\[\left(6^n(-1)^{n+1}\right)_{n\in\mathbb{N}\cup\{0\}}\]

OpenStudy (across):

\(-39991\)

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