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Homework Help: Binomial probability function

  1. Oct 2, 2012 #1
    1. The problem statement, all variables and given/known data

    Screenshot2012-10-02at22226AM.png

    2. Relevant equations
    3. The attempt at a solution

    do you see where it says 5 over 2 = 10 and 5 over 3 = 10. How? I don't get what they're doing.
     
  2. jcsd
  3. Oct 2, 2012 #2
    never mind i got it.

    n!/(x!(n-x)!)
     
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