新GRE数学重要知识点汇总.

　　新GRE数学重要知识点汇总。GRE数学备考，要注重平时的练习与知识积累。以下是澳际小编整理的重要知识点汇总，下面和澳际小编一起来看看：

　　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)!).

　　Example:

　　Number of possible ways to pick 4 oscar nominations from a list of 50 movies is 50!/(4!*(50-4)!)=50!/(4!*46!)=50*49*48*47/24=230300.

　　Remember:

　　This does not apply if there are identical objects.

　　Permutation of Objects

　　The number of ways n distinct objects can be ordered is n.

　　Example:

　　Number of ways 6 people can from a queue is 6.

　　Number of ways 5 different cars can be parked in 5 parking spaces is 5.

　　Remember:

　　This does not apply if there are identical objects or ordering does not matter.

　　以上就是新GRE数学重要知识点汇总的介绍，希望对同学们的GRE数学考试有所帮。助同学们在gre备考时多积累练习，才可以在gre考试中运用的得心应手。澳际小编预祝同学们在gre考试中取得好的成绩。