Functions as Power Series

1. May 14, 2009

lha08

1. The problem statement, all variables and given/known data
I'm having a little trouble concerning the part where we have to calculate the endpoints of a known interval of convergence in order to see whether they are convergent or divergent. In this case, is the summation of n=0 to infinity of (-1)^n/10 diverging or converging. Are there any tests to prove that? I'm kinda confused. Thanks

2. Relevant equations

3. The attempt at a solution

2. May 14, 2009

Staff: Mentor

Have you looked at the alternating series test?

3. May 14, 2009

lha08

uhh yea, but it just gives bn= 1/10 which doesn;t make sense...i think

4. May 14, 2009

Dick

(-1)^n/10 doesn't converge. Don't be silly. It doesn't even approach 0. Did you mean to post something else?