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Summation of series

  1. Apr 1, 2013 #1
    Please see attached image.

    I don't understand how is it so. :confused:

    (Attempt): I already thought very hard, and obviously for this kind of mathematical rules, if i don't know the concept, i can't really make any attempt right? Just give me some hint then.

    Thanks.
     

    Attached Files:

  2. jcsd
  3. Apr 1, 2013 #2

    ehild

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    Write out the series for n=2, 3, 4, ... and compare it with the series 1+22+32+....

    ehild
     
  4. Apr 1, 2013 #3
    Okay, I suddenly see light. The whole thing is clear, thanks.
     
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