2013年4月gre考试:gre数学考点分析
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 sele... [ 查看全文 ]2013年4月gre考试:gre数学考点分析的相关文章