Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Nth term of alternating series with two positive terms at beginning

  1. Mar 12, 2013 #1
    (I hope this is the right subforum)
    I'm talking about the series 1, 1, -1, 1, -1, 1, -1... I thought about it for a long time but I have no idea. If that first term were gone it would just be (-1)^(n+1), but...it's there...
     
  2. jcsd
  3. Mar 12, 2013 #2

    Mark44

    Staff: Mentor

    Just write it as 1 + your alternating series.
     
  4. Mar 12, 2013 #3

    pwsnafu

    User Avatar
    Science Advisor

    What's wrong with a1 = 1, and an = (-1)n for n > 1?
     
  5. Mar 12, 2013 #4
    Yeah that works, I was just wondering if there was a better way to do it.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Nth term of alternating series with two positive terms at beginning
Loading...