GRE数学考点：set、排列、组合

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SetA 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}.
Com ...

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关键词：GRE Set Collection arranging remember