| http://www.w3.org/ns/prov#value | - Remember that two-thirds of the possible families have a first-child boy, and two-thirds have a second-child boy - it is not 50-50 in this case, because we have eliminated all the girl-girl families, and the boy-boy families are in both groups.But now consider this - if you know at least one of their kids is a boy because he is standing right next to them, then the odds move to 50%.
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