有10张奖劵,其中有两张有奖,甲乙丙三人一次各抽取一张.乙中奖的概率是多少

I know how you got the number,but you didn't make the question right.Two assumptions needed:1.乙中奖 but 甲丙 are not2.甲抽取first 乙抽取second 丙抽取third.Then you could have (8/10) * (2/9) * (7/8) =...