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− | <math>\sum_{n = M}^N \alpha^n</math> | + | <math>\sum_{n = M}^N \alpha^n = \alpha^M - \alpha^{N-1}</math> |
Revision as of 01:41, 20 July 2009
$ \sum_{n = M}^N \alpha^n = \alpha^M - \alpha^{N-1} $
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− | <math>\sum_{n = M}^N \alpha^n</math> | + | <math>\sum_{n = M}^N \alpha^n = \alpha^M - \alpha^{N-1}</math> |
$ \sum_{n = M}^N \alpha^n = \alpha^M - \alpha^{N-1} $