I need to find the sum of:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\sum_{n=2}^\infty\frac{50(-2)^{n-1}3^{n+2}}{7^n}[/tex]

the only series that we've been taught to add up is geometric. the above series is not geometric,is it?

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# Homework Help: Find the sum of the series

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