新GRE数学重要考点8

>>GRE数学考点：新GRE数学重要考点8

>>GRE考试精品课程训练

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}.

Combinations

Number of ways we can select n objects from a group of m distinct objects is m!/(n!*(m-n)!).

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