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March 28, 2017

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How may committees of size 4 is to be selected from a group of 7 local students and 6 overseas students.

  • math - ,

    7+6=13 students.
    choose 4 to make a committee.

    Number of ways
    = 13 choose 4
    = C(13,4)
    = (13,4)
    =13!/(4!(13-4)!)
    =13!/(4!9!)

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