Choice number

  • Thread starter Dragonfall
  • Start date
  • #1
1,030
4
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.
 

Answers and Replies

  • #2
290
2
Every natural number has that property, remember that x choose 1 is x.
 

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