[理工] [機率] 一題條件機率
From families with three children,a family is selected at random
and found to have a boy. What is the probability that the boy has
(a)an older brother and a younger sister (b)an older brother
(c)a brother and a sister? Assume that in a three-child family
all gender distributions have equal probabilities.
a小題答案是1/14 b小題是13/42 c小題是3/7
感謝幫忙回答的人
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