条件概率题: a company has 255 employees. If one employee is randomly selected, is the probability that the employee is a woman and has a college degree less than 1/2?
a) 135 employees do not (原题就在not下划了道线) have colleage degree
题目问的a woman and has a college degree,现在条件一已经说了135个人do not have degree,题目里交待共有255个人,剩下的人中have degree只有120个人,即便全部是woman,其概率也是less 1/2,单独充分;条件二因为不知道拥有学历的人数,所以可能会出现两种结果