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交集和并集
Intersection of two sets is another set with only the members that are in both sets. If the two sets do not share any common member， the intersection is the empty set with no member.
Example：
Intersection of {1，2，3} and {2，3，5} is the set {2，3}。
Intersection of the set with all primes and the set with all even numbers is the set {2} since only 2 is both even and prime.
Intersection of {1，2，3} and {4，5，6} is the empty set {}。
Remember：
Intersection contains only the common members.
Two sets are disjoint if they have no member in common， that is they have an empty intersection.
union of Sets
union of two sets is another set with all the members from both sets.
以上是新GRE數(shù)學備考中關于交集和并集的內(nèi)容，大家在備考的時候不妨分考點來復習，將做錯的題整理出來，考前一個星期內(nèi)集中再過一遍。
新GRE數(shù)學考點：Set
A set is a collection of objects or things. Each object in a set a member or element of that set.Size of a set is the number of members in the set.
Example:
The set of even numbers between 2 and 10 is of size 5:{2,4,6,8,10}.
The set of primes between 2 and 10 is of size 4:{2,3,5,7}.
Remember:
Each member of set A belongs to A or is in the set A.
A set can not have repeating member:{1,3,1,2}is not a set.
Rearranging the order of the members does not change the set:{1,2,3}is same as{3,2,1}.
有一部分考生認為新GRE數(shù)學具有一定的難度，這其中的原因是由于考生在復習時沒有把新gre數(shù)學的基礎打牢。想要新gre數(shù)學考好，復習的時候一定要把基本概念和重要GRE數(shù)學考點都弄扎實。
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