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| − | <math>\sum_{n = M}^N \alpha^n = \alpha^M - \alpha^{N-1} | + | <math>\sum_{n = M}^N \alpha^n = \frac{\alpha^M - \alpha^{N-1}}{(1 - \alpha)}</math> |
*What if <math>\alpha=1</math>???? | *What if <math>\alpha=1</math>???? | ||
Revision as of 07:14, 29 September 2010
$ \sum_{n = M}^N \alpha^n = \frac{\alpha^M - \alpha^{N-1}}{(1 - \alpha)} $
- What if $ \alpha=1 $????
