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Choice number

  1. Feb 4, 2009 #1
    Is there a fast way of determining whether a number x is of the form "a choose b" for some a and b (a and b are not given, obviously)? I guess a good way to start is to find the largest factorial which divides x.
     
  2. jcsd
  3. Feb 4, 2009 #2
    Every natural number has that property, remember that x choose 1 is x.
     
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