Results 1 to 3 of 3

Math Help - Convergence of Series

  1. #1
    Del
    Del is offline
    Member
    Joined
    Nov 2007
    Posts
    83

    Convergence of Series

    Hey, I need to find if these Converge or Diverge. Please help!


    ∑ (−1)^n−1 / √n
    n=1



    ∑ (−1)^n−1 / n√n
    n=1



    ∑ (−1)^n * n / 3 + n
    n=1



    ∑ sin(2n) / n^2
    n=1



    ∑ cos(n*pi / 3) / n!
    n=1



    ∑ (-1)^n * n / 3 + ln(n)
    n=1
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member Peritus's Avatar
    Joined
    Nov 2007
    Posts
    397
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Del
    Del is offline
    Member
    Joined
    Nov 2007
    Posts
    83
    I solved them, but I'd like you guys to check my solutions, as I only have one chance to input my answer and I'm still a bit unsound on my methods:

    1. Divergent

    2. Convergent

    3. Convergent

    4. Divergent

    5. Divergent

    6. Convergent

    (correspond to the order I posted the problems)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 5
    Last Post: October 3rd 2011, 01:12 AM
  2. Replies: 2
    Last Post: May 1st 2010, 09:22 PM
  3. Replies: 4
    Last Post: December 1st 2009, 03:23 PM
  4. Replies: 7
    Last Post: October 12th 2009, 10:10 AM
  5. series convergence and radius of convergence
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 15th 2008, 08:07 AM

Search Tags


/mathhelpforum @mathhelpforum