新GRE数学重要考点7

>>GRE数学考点：新GRE数学重要考点7

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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

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