1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    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!

Summation inside a summation inside a summation

  1. Sep 15, 2012 #1

    qwerty12345

    User Avatar

    IMG_20120915_210615.jpg


    I know how to do it normally, but this confuses me. Can you show me how to do it? And what were the steps you took... etc. Initially, I thought of putting them inside brtackets and work out the last one at the right first, but I'd need to know what K and J are, it's confusing. Can anyone make this clear for me?



    EDIT:
    IMG_20120915_222841.jpg

    I tried this, but it doesn't seem like I'm on the right track.
     
    Last edited: Sep 15, 2012
    qwerty12345, Sep 15, 2012
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. Sep 15, 2012 #2

    qwerty12345

    User Avatar

    IMG_20120915_230928.jpg

    But I also solved it with a calculator and it says the answer is 81. What am I doing wrong?
     
    qwerty12345, Sep 15, 2012
  4. Sep 15, 2012 #3

    qwerty12345

    User Avatar

    Nevermind. I figured it out. :D

    IMG_20120915_232603.jpg
     
    qwerty12345, Sep 15, 2012
  5. Sep 15, 2012 #4

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    1-1+1 = 1 not -1 ... that's if you mean i - j + k and not i - (j + k) .
     
    SammyS, Sep 15, 2012
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Summation inside a summation inside a summation

  1. Summation of series (Replies: 2)

  2. Summation problem (Replies: 3)

  3. Summation of series (Replies: 4)

  4. Summation question (Replies: 5)

  5. Summation by steps (Replies: 7)

Loading...