1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Sigma Notation help requested

  1. Apr 12, 2012 #1
    1. The problem statement, all variables and given/known data

    "Express the following sum in sigma notation:

    1 + (2/3) + (3/5) + (4/7) + (5/9)"

    2. Relevant equations

    3. The attempt at a solution

    I've figured out what they all have in common (1+2=3, 2+3=5, 3+4=7, 4+5=9) but I've been searching through the book and on the internet how to express this.
  2. jcsd
  3. Apr 12, 2012 #2
    Suppose the kth term is n(k)/d(k). Can you find a pattern to how the numerator and denominator change with k?
  4. Apr 12, 2012 #3
    I just figured it out. Apparently I just needed to finally ask for help.

    The equation is (i/2i-1) with start i=1 and end at 5.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook