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Equivalent form for Binomial Expression?

  1. Jul 17, 2013 #1
    Is there a way to express ##{n\choose k}{n\choose r}## in another form without n as the "top" of the binomial coefficient? I remember seeing it once but I forgot what it was.
  2. jcsd
  3. Jul 17, 2013 #2


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    Maybe something here will do:

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