新 GRE 数学重要考点：AT least One今日针对新版 gre 数学复习，我给大家整理的是关于 AT least One 的相关内容，这些概念在考试中确定会考到的。期望考生能再接再厉，取得一个好成果，突破新版 gre 数学难的逆境。 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.
