Question 1118782
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Depends.  Do you mean


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sum_{n=1}^\infty\,\frac{2^{n-1}}{3^n}]


or


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sum_{n=1}^\infty\,\frac{2^n\,-\,1}{3^n}]
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}

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