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#### Alexmahone

##### Active member

- Jan 26, 2012

- 268

- Thread starter Alexmahone
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- Jan 26, 2012

- 268

I think it can always be applied. Other test just may be easier for a given power series.

You actually should always do the ratio test on the series of ABSOLUTE VALUES, to prove absolute convergence (i.e. to show the series is bounded both above and below by the series of absolute values and the negative of the series of absolute values).