新版GRE数学重要考点——Combinations of Choices

2022-05-24 18:30:35

  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!/(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.

  很多新版gre数学复习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,再记住一些新版gre数学必备的词汇,那么相信新版gre数学应该没有问题。