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Homework Help: Working with binomial identieies.

  1. Apr 16, 2009 #1

    I'm having problems proving this. However, here is my reasoning:

    when factoring out an r you get


    Is this proper reasoning?
  2. jcsd
  3. Apr 16, 2009 #2
    That looks good. I think there is a typo in the problem the way it is stated. What is n?!

    I think it should read (r-1)Ck on the right side, not (n-1)Ck.
  4. Apr 16, 2009 #3
    Was that an actual proof of the identity?
  5. Apr 16, 2009 #4


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    It would be if you write r instead of n in the original statement as Russell Berty pointed out.
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