| http://www.w3.org/ns/prov#value | - However, the correct answer is 1/3 as shown by the following argument:For a single birth, there are two possibilities (a boy or a girl) with equal probability.Therefore, for two births, there are four possibilities: 1) two boys, 2) two girls, 3) first a boy, then a girl, and 4) first a girl, then a boy; all of them have equal probability.We are given that one of the children is a boy.
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