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2013年新gre考试:gre数学考点之Conditional详解

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2013-04-03 17:08

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新gre考试gre数学

【 liuxuequn.com - GRE数学 】

    Conditional

  Probability of event A conditioned on the fact that event B has happened is called the conditional probability and written as P(AIB).

  P(AIB)=Probability Both A and B happens/ Probability B happens.

    Example:

  A six-sided die with faces from 1 to 6 is rolled twice. What is the probability that the face 5 turned up on first try given that the sum of the two faces is 9?

  P(sum of faces is 9)=4/36=1/9.

  P(face 5 turns up on the first try and sum is 9)=(1/6)*(1/6)=1/36.

  P(face 5 turned up on first try given sum is 9)=(1/36)*(1/9)=1/4

    Remember:

  If P(AIB)=P(A),then two events A and B are independent, that is occurrence of one does not influence the other

  以上就是GRE数学常考题总结,大家需要多加练习,总结易错点,进行集中突击。在考前,最好把错题都重看一遍,以免在考场上犯同样的错误。

  想了解更多GRE数学网的资讯,请访问: GRE数学

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