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Homework Help: Sum of Series.

  1. Nov 8, 2007 #1
    1. The problem statement, all variables and given/known data
    Find the sum of the following series


    3. The attempt at a solution



  2. jcsd
  3. Nov 8, 2007 #2
    I am not really sure of how to do this but looking at your last line, I think you messed up taking the second derivative of x^2/(1-x) since you need to use the quotient rule, the (1-x) should be squared on each derivative
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