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== Infinite geometric series formula assuming <math>|r|<1</math> == | == Infinite geometric series formula assuming <math>|r|<1</math> == | ||
Latest revision as of 05:45, 26 January 2009
Infinite geometric series formula assuming $ |r|<1 $
- $ \sum_{k=1}^\infty ar^{k-1}=\frac{a}{1-r} $
- $ \sum_{k=1}^\infty kar^{k-1}=\frac{a}{(1-r)^2} $
Finite sum of a geometric sequence (which does no require $ |r|<1 $)
- $ \sum_{k=1}^K ar^{k-1}=\frac{a(1-r^K)}{1-r} $
