# Using the limit comparison test

1. Apr 2, 2012

### hivesaeed4

I'm given the following:
3/(n(2^(n-1)))
I have to determine convergence using the limit comparison test. I've proved its convergent using the ratio test but am struggling with which term do I divide the above for the limit comparison test. Help?

2. Apr 2, 2012

### hivesaeed4

Don't bother replying. I figured it out.

3. Apr 2, 2012

### hivesaeed4

I have just one question. Suppose the limit comparison test evaluates to infinity. Would it still prove convergence?

4. Apr 3, 2012

### DonAntonio

Either you're asking something else or you're confusing the limit comparison test: this test tells you that if the limit of the quotient of two positive sequences exists finitely and is NOT zero, then the series whose general term is one of the seq's converges iff the series whose general term is the other seq. converges...so what's your question?

DonAntonio

5. Apr 3, 2012

### hivesaeed4

Sorry. I should have been clearer. The question was if the limit comparison test evaluates to infinity and we used a series whose general term was known to be convergent then the series whose general term's convergence we have to determine, is it also convergent. You answered that question by stating the finite part. Thanks