新GRE数学重要考点:Total Members

所属专题:GRE数学重要考点  来源:互联网    要点:GRE考试  
编辑点评: 2011新GRE考试实施以来,考生们不仅对写作部分茫然不知所措,就连对我们所擅长的数学也甚是担忧。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。

Total Members

Sometimes there are members that do not belong to either set A or B.In that case the total number of members=Size A+Size B-Number of common members+Number of members not in A or B.

Example:

In an office, 35 people drink coffee, 27 drink tea, 12 drink both, and 4 drink neither. The total number of people in the office = 35+27-12+4=54.

In a class of 40 students, 20 study algebra, 15 study geometry, 8 study both.The total number of students that do not study either=40-(20+15-8)=13.

Remember:

This is a relation between five numbers, and any one can be calculated given the other four.

由于美国数学基础教育的难度增加导致数学考试越来越难,但新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。

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