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新GRE数学复习重点 排列考点
日期:2013-12-09 16:31

(单词翻译:单击)

  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。

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重点单词
  • identicaladj. 相同的,同一的
  • collectionn. 收集,收取,聚集,收藏品,募捐
  • orderingn. [计]定序;排序;订购 v. 命令;指挥;订购(o
  • distinctadj. 独特的,不同的,明显的,清楚的