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1、智 课 网 G R E 备 考 资 料新GRE数学重点知识点解析之排列考点-智课教育旗下智课教育新GRE数学重点知识点解析,本文就排列有关的GRE数学考试点做 介绍,希望可以供考生参考,更好地准备GRE考试,并最终取得理想的 考生成绩。 本文就GRE数学排列有关的新GRE数学重点知识点做解析,希望大 家复习的时候一定要把新GRE数学考点弄扎实。 Permutation of Objects The number of ways n distinct objects can be ordered is n!. Example: Number of ways 6 people can from a
2、 queue is 6!. Number of ways 5 different cars can be parked in 5 parking spaces is 5!. Remember: This does not apply if there are identical objects or ordering does not matter. Permutation with Selection The number of ways n objects drawn from a collection of m distinct objects can be ordered is m!/
3、(m-n)!.Example: Number of ways a queue of length 3 can be formed from a group of 5 people is 5!/(5-3)!=5!/2!=5*4*3=60. Number of possible top ten list for 150 movies is 150!/(150-10)!. Remember: This does not apply if there are identical objects or ordering does not matter. 上述就是GRE数学排列有关的新GRE数学重点知识点解析,希望可 以给大家一些参考,从而更好地备考GRE数学。