新GRE数学复习重点 排列考点.

　　如果新GRE数学考点都没有复习到，如何能拿到满意的GRE数学分数呢?所以说，想要新GRE数学考好，复习的时候一定要把新GRE数学考点弄扎实。下面为大家介绍GRE数学排列考点。

　　Permutation of Objects

　　The number of ways n distinct objects can be ordered is n!.

　　Example:

　　Number of ways 6 people can from a 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!/(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.

　　由于美国数学基础教育的难度增加导致新GRE数学越来越难，但GRE数学考点都是高中时候学到的知识点，考生不要过于紧张，把基本概念弄明白，再记住一些新GRE数学必备的词汇，那么相信新GRE数学应该没有问题。