og上一段内容没看懂啥意思，求教

hhhlll · 发表于 2011-5-9 11:31:08

Two events A and B are said to be independent if the occurence of either event does not alter the probability that the other event occurs,For one roll of the number cube,let A={2，4，6}and let B={5,6}. Then the probability that A occurs is P(A)=|A|/6=3/6=1/2,while,persuming B occurs,the probability that A occurs is
|A∩B|/|B|=|{6}|/|{5,6}=1/2

og上的一段内容，我没有看懂这个||A∩B|/|B|=|{6}|/|{5,6}=1/2什么意思，为啥做这个东西？是说B发生的情况下A发生的概率？？？

og上一段内容没看懂啥意思，求教

所属分类: GMAT考试

正在浏览此版块的会员 ()