# Homework Help: Calculus 2, Series Convergence Questions?

1. Apr 12, 2012

### MMhawk607

I have some problems here with Series and Convergence...

Here are the problems and my guesses at it.

http://img822.imageshack.us/img822/9523/23341530.png [Broken]

It won't tell me which one is wrong, but it just says one/all is wrong. Any help is appreciated.

Attempts at solving, I tried using ratio test for these but I can't seem to get it. I need more comprehension of these types of problems I know, but these problems are due by tonight.
Alternating series really give me trouble too.

Last edited by a moderator: May 5, 2017
2. Apr 12, 2012

### MMhawk607

OH

It was because of the third problem

sin(3n)/n^2

Is it because

sin(3n) / (n^2) ≤ 1/(n^2)

Therefore the p test makes it absolutely convergent?

I had the other 4 right, I figured that one was A though, is this the reason?

3. Apr 12, 2012

### SammyS

Staff Emeritus
Hello MMhawk607. Welcome to PF !

Yes, you had #3 wrong .

It is absolutely convergent.

4. Apr 12, 2012

### SammyS

Staff Emeritus
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Last edited by a moderator: May 5, 2017