新版gre数学复习重要考点：排列

　　俗话说：工欲善其事必先利其器。很多参加了新版gre考试的同学都觉得数学有点难度，相信这其中的原因还是由于考生在新版gre数学复习时没有把基础打牢。如果新版gre数学基本考点都没有复习到，如何能拿到分数呢?所以说，想要新版gre数学考好，复习的时候一定要把基本概念和重要考点都弄扎实。

　　今天针对新版gre数学复习，小编给大家整理的是关于Combinations of Choices的相关内容，这些概念在考试中一定会考到的。希望考生能再接再厉，取得一个好成绩，突破新版gre数学难的困境。

　　新版gre数学复习重要考点：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.

　　新版gre数学复习重要考点：Permutation with Selection

　　The number of ways n objects drawn from a collection of m distinct objects can be ordered is m!/!.

　　Example:

　　Number of ways a queue of length 3 can be formed from a group of 5 people is 5!/!=5!/2!=543=60.

　　Number of possible top ten list for 150 movies is 150!/!.

　　Remember:

　　This does not apply if there are identical objects or ordering does not matter.