新版GRE数学复习重要考点:AT least One

所属专题:GRE数学重要考点  来源:    要点:GRE考试  
编辑点评: 新GRE数学考试的难度有所增加,但是只要大家认真准备,掌握了基本的知识,还是可以在原有的水平上考出出色的分数的。本文为大家整理汇总了新GRE数学考试的复习要点,希望对大家的复习有所帮助。

本文为大家介绍的GRE数学复习考点是“小数”。

新版GRE数学复习重要考点:AT least One

If probability of event A happening is p and event B happening is q, then the probability that at least one of them happens is (p+q).

Example:

There are 20 quarters, 33 nickels, and 47 pennies in a jar. The probability that a randomly selected coin is a quarter= 20/(20+33+47)=20/100=0.2 and the coin is nickel = 33/100 =0.33.The probability it is either a quarter or a nickel = 0.2+0.33=0.53.

Remember:

The events needs to be mutually exclusive, that is if one happens the other cannot happen: a coin is either a quarter or nickel but not both.

以上的内容大家一定要好好掌握,在考试的时候发挥出自己应有的水平。  

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