最新提问
我的动态
登录后查看动态
题目内容双击单词支持查询和收藏哦~
Two bags, A and B, each contain marbles some of which are green. If one marble is selected at random from each bag, the probability is $$\frac{1}{21}$$ that both of the marbles selected will be green. If one marble is selected at random from bag A only, the probability is $$\frac{5}{21}$$ that the marble selected will be green. If one marble is selected at random from bag B only, what is the probability that the marble selected will be green?
Give your answer as a fraction.
Give your answer as a fraction.
1 /5显示答案
· 相关考点
6.4.3 独立事件
6.4.3 独立事件
以上解析由 考满分老师提供。