新GRE數學復習要點:Conditional

　　新gre數學的難度相當于高中數學水平，只要大家認真復習，在新gre數學考試中拿高分甚至拿滿分都是很有可能的。不過大家也不能忽略新gre數學中可能會出現的考點難點。下面，為大家整理新GRE數學復習要點:Conditional，希望對大家有所幫助。

　　Conditional

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

　　P=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=4/36=1/9.

　　P==1/36.

　　P==1/4

　　Remember:

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

　　應對gre數學考試的時候，考生不要過于緊張，把基本概念弄明白，再記住一些新版gre數學必備的詞匯，那么相信新版gre數學應該沒有問題。