新gre數(shù)學(xué)考點標準偏差和排列組合gre數(shù)學(xué)(文件)
【正文】 the order of the members does not change the set:{1,2,3}is same as{3,2,1}. Combinations Number of ways we can select n objects from a group of m distinct objects is m!/(n!*(mn)!). Example: Number of possible ways to pick 4 oscar nominations from a list of 50 movies is 50!/(4!*(504)!)=50!/(4!*46!)=50*49*48*47/24=230300.
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