新gre数学的难度相当于高中数学水平，只要大家认真复习，在新gre数学考试中拿高分甚至拿满分都是很有可能的。不过大家也不能忽略新gre数学中可能会出现的考点难点。下面，无忧留学就为大家整理新GRE数学复习要点:Conditional，希望对大家有所帮助。获得更多gre考试咨询点击进入>>>>无忧免费咨询顾问或联系QQ客服：

　　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

　　应对gre数学考试的时候，考生不要过于紧张，把基本概念弄明白，再记住一些新版gre数学必备的词汇，那么相信新版gre数学应该没有问题。

　　相关链接：

　　15例gre数学难题练习及答案解析

　　GRE数学 最后20天要闯7大关

　　gre考试常用数学公式大全

　　GRE数学立体几何常用公式

　　gre数学考试代数部分词汇汇总