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Two balls are to be randomly selected from a bag, one at a time and without replacement. The probability that the first ball selected will be red is $$\frac{5}{8}$$. If the first ball selected is not red, the probability that the second ball selected will be red is $$\frac{2}{3}$$. What is the probability that the first or the second ball selected will be red (that is, one red ball either in the first attempt, or in the second attempt, but not both)?
Give your answer as a $$\underline{fraction}$$.
Give your answer as a $$\underline{fraction}$$.
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· 相关考点
6.4.4 条件概率
6.4.4 条件概率
以上解析由 考满分老师提供。
