| http://www.w3.org/ns/prov#value | - Knowing only that, the answer is 1/3.In order to get an answer of 50%, you must assume additional knowledge - which kid is a boy (note that even in your example, it does not matter if the person to whom you are speaking only knows the gender of one kid; it only matters if you know that).But if you are going to assume additional knowledge, you might just as well assume you know the other kid is also a
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