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.

由于美國(guó)數(shù)學(xué)基礎(chǔ)教育的難度增加導(dǎo)致數(shù)學(xué)考試越來(lái)越難，但新GRE數(shù)學(xué)復(fù)習(xí)考點(diǎn)都是高中時(shí)候?qū)W到的知識(shí)點(diǎn)，考生不要過(guò)于緊張，把基本概念弄明白，再記住一些新版GRE數(shù)學(xué)必備的詞匯，那么相信新版GRE數(shù)學(xué)應(yīng)該沒(méi)有問(wèn)題。