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N points on a circle

  1. Oct 31, 2007 #1
    1. The problem statement, all variables and given/known data
    How many ways can you put n points on a circle? It is something like n!/2, right?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 31, 2007 #2


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    No, it's n!/n. You have to identify cyclic permutations of a linear ordering. With an extra factor of 1/2 if you allow the circle to flip over.
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