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There are 27 students on the college debate team what 's the pobability

  1. Jan 10, 2009 #1
    Help...

    1. The problem statement, all variables and given/known data

    there are 27 students on the college debate team what 's the pobability that at least 5 of them have their birthday in the same month??


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 10, 2009 #2
    Please show


    2. Relevant equations



    3. The attempt at a solution
     
  4. Jul 27, 2010 #3
    Sum from x=5 to x=27 of
    Choose(27,x)*(1/12)x*(11/12)27-x

    Can anybody confirm?
     
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