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Homework Help: Number of ways question

  1. May 10, 2006 #1
    "Number of ways" question

    A circle has random points on its circumferance. How many ways can you form a quadrilateral, a triangle, and a octagon using these points?

    I have no idea how to get an numerical answers for this question without using n to represent the number of points on the circle.

  2. jcsd
  3. May 10, 2006 #2
    I think using 'n' is fine...just make a correct formula such that for any n you can get a specific answer.
  4. May 13, 2006 #3
    Of course you need n.
    In how many ways can you choose the vertices of an r sided polygon from n points ?
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