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新GRE数学备考的重点有哪些?

2018-10-23

来源:互联网

小编:白洋 398
摘要:

  针对新GRE考试来说,特别是数学方法,大家在备考里需要掌握哪些重点内容才能让备考效率更高呢?所以接下来要为大家分析一下关于新GRE数学备考的重点有哪些。

  新GRE数学备考的重点一: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}.

  GRE数学备考的重点二: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.

  GRE数学备考的重点三: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.

  GRE数学备考的重点四:Permutation with Selection

  The number of ways n objects drawn from a collection of m distinct objects

  can be ordered is m!/(m-n)!.

  Example:

  Number of ways a queue of length 3 can be formed from a group of 5 people

  is 5!/(5-3)!=5!/2!=5*4*3=60.

  Number of possible top ten list for 150 movies is 150!/(150-10)!.

  Remember:

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

  matter.

  以上是环球教育小编跟大家分享的关于新GRE数学备考的重点有哪些,希望对大家有所帮助!在这里还要预祝大家在GRE考试中取得佳绩!


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