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*For what values of M and N does this formula hold? Can they both be negative? Does N need to be greater than M? | *For what values of M and N does this formula hold? Can they both be negative? Does N need to be greater than M? | ||
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Latest revision as of 08:27, 7 September 2011
A useful Geometric Series formula
$ \sum_{n = M}^N \alpha^n = \frac{\alpha^M - \alpha^{N-1}}{(1 - \alpha)} $
- What if $ \alpha=1 $????
- For what values of M and N does this formula hold? Can they both be negative? Does N need to be greater than M?
