新GRE数学考点:Combinations of Choices-查字典英语网
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新GRE数学考点:Combinations of Choices

发布时间:2016-03-02  编辑:查字典英语网小编

  今天针对新gre数学复习,小编给大家整理的是关于排列、组合的相关内容,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gre数学难的困境。

  Combinations of Choices

  If there are n choices for one type and m choices for second type, then number of combinations for both types is the product of choices:nm.

  Example:

  If there are 3 kinds of breads to choose from and 4 kinds of meats, then we can make 34=12 different sandwiches.

  If an alphabet has 26 letters, then the number of possible 2 letter word is 2626=676.All of them may not be vaild words.

  Remember:

  Do not add the choices to get the total combinations.

  The product rule can be applied to more than two types of choices: if there are 3 kinds of breads, 4 kinds of meats, and 6 kinds of cheeses, then we can make 346=72 different sandwiches.

  俗话说:工欲善其事必先利其器。有一部分考生认为新GRE数学具有一定的难度,这其中的原因是由于考生在复习时没有把新gre数学的基础打牢。想要新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。

  

  

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