Calculus: Absolute/Conditional Convergence or Divergence Question

[zachem62]

Homework Statement

This is the problem:

http://i.imgur.com/AtISqng.jpg

its the first series, not the second one with the cos

Homework Equations

The Attempt at a Solution

so anyways i did this question but i just had one doubt. in every other question like this that I've done, the series summation goes from n=1 or something and goes to infinity. in this question, the summation starts at n=2 and goes to...just n. so can i solve this just as if the summation was going to infinity or do i have to do it differently?

Thanks!

 

[LCKurtz]

That is undoubtedly a typo and should go to infinity. There would be no notion of convergence for a finite number of terms plus it makes no sense for an index to go to itself.