infinity over sigma n=1 (-1)^n*n^4/n^3+1 Find if the series converges absolutely or not at all.
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Originally Posted by Link88 infinity over sigma n=1 (-1)^n*n^4/n^3+1 Find if the series converges absolutely or not at all. do you mean $\displaystyle \sum_{n = 1}^\infty \frac {(-1)^n n^4}{n^3 + 1}$?? consider this: $\displaystyle \lim_{n \to \infty} \frac {n^4}{n^3 + 1} = \infty$
what test should i use to show this?
Originally Posted by Link88 what test should i use to show this? The fact that $\displaystyle | a_n | \not \rightarrow 0$ should be a pretty good clue I would have thought ....
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