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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.
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· 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。
