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Homework Help: Logs and rearranging

  1. Mar 3, 2008 #1
    [SOLVED] Logs and rearranging

    1. The problem statement, all variables and given/known data

    I want to show that NlnN - n1ln(n1) - n2ln(n2) is equal to:

    -N{(n1/N)ln(n1/N) + (n2/N)ln(n2/N)}

    apparently i can do this by the artifice of adding and subtracting the term n1lnN and then regrouping.

    2. Relevant equations

    3. The attempt at a solution

    I can get the form required but i still have leftover N's and n1s and n2s, anyone know how to do this? thanks
  2. jcsd
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