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GRE数学重要知识点:组合

时间:2019-12-02 09:47:00   来源:新东方在线     [字体: ]

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  Combinations


  Number of ways we can select n objects from a group of m distinct objects is m!/(n!*(m-n)!).


  Example:


  Number of possible ways to pick 4 oscar nominations from a list of 50 movies is 50!/(4!*(50-4)!)=50!/(4!*46!)=50*49*48*47/24=230300.


  Remember:


  This does not apply if there are identical objects.