新gre數(shù)學(xué)重要考點：Conditional.

　　2011新gre考試實施以來，不僅對寫作部分茫然不知所措，就連我們所擅長的數(shù)學(xué)也甚是擔(dān)憂，相信這其中的原因還是由于考生在新gre數(shù)學(xué)復(fù)習(xí)時沒有把基礎(chǔ)打牢。如果新版gre數(shù)學(xué)基本考點都沒有復(fù)習(xí)到，如何能拿到分數(shù)呢?所以說，想要新版gre數(shù)學(xué)考好，復(fù)習(xí)的時候一定要把基本概念和重要考點都弄扎實。

　　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.獲得更多gre考試咨詢點擊進入>>>>澳際免費咨詢顧問或聯(lián)系QQ客服：

　　Remember:

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

　　由于美國數(shù)學(xué)基礎(chǔ)教育的難度增加導(dǎo)致數(shù)學(xué)考試越來越難，但新gre數(shù)學(xué)復(fù)習(xí)考點都是高中時候?qū)W到的知識點，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(shù)學(xué)必備的詞匯，那么相信新版gre數(shù)學(xué)應(yīng)該沒有問題。

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