本文为大家介绍的GRE数学复习考点是“排列”。

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!/(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.

以上的内容大家一定要好好掌握，在考试的时候发挥出自己应有的水平。