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。