條件機率小題目

Question： Suppose a family has children, one of which is a boy. What is the probability that both children are boys?web A)1 / 3 B)1 / 2 C)2 / 3 D)1 / 9ide 這種題目真的會把人繞暈，解答： 1/2：理解爲第一個是男孩,第二個也是男孩的機率,兩個機率

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