今天針對新版gre數(shù)學(xué)復(fù)習(xí)，小編給大家整理的是關(guān)于AT least One的相關(guān)內(nèi)容，這些概念在考試中一定會(huì)考到的。希望考生能再接再厲，取得一個(gè)好成績，突破新版gre數(shù)學(xué)難的困境。

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.