For the ratio test:

Is (2n-1) + 1 = 2n?

I have to use the ratio test to evaluate n2/(2n-1)! where n=1 for an infinite series...exam in a few hrs!

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- Jan 16th 2008, 10:37 PMJoanna JakmaRatio test help -simple Question
For the ratio test:

Is (2n-1) + 1 = 2n?

I have to use the ratio test to evaluate n2/(2n-1)! where n=1 for an infinite series...exam in a few hrs! - Jan 16th 2008, 10:42 PMJhevon
yes...this should be simple algebra for someone dealing with series. and what does this have to do with the ratio test?

Quote:

I have to use the ratio test to evaluate n2/(2n-1)! where n=1 for an infinite series...exam in a few hrs!

if so, we want to see if

if so, the series converges absolutely

by the way, what you wanted was 2(n + 1) - 1 = 2n + 1, not what you said before - Jan 16th 2008, 11:41 PMJoanna Jakma
CHeers for that!

Yes you got it right.

But surely

(2n-1)+1 = 2n? as opposed to 2n+1?

So when doing the ratio test should it not be 2n! as opposed to (2n+1)! in that equation? I'm confused :( - Jan 17th 2008, 12:28 AMmr fantastic