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。
adj. 独特的,不同的,明显的,清楚的