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Usenet Newsgroups : rec.puzzles Hall of Fame


The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided.

Many of these puzzles also appear in Braingle's own collection.

   
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Categories : probability : oldest.girl.p

You meet a stranger on the street, and ask how many children he has.  He
truthfully says two.  You ask "Is the older one a girl?"  He truthfully
says yes.  What is the probability that both children are girls?  What
would the probability be if your second question had been "Is at least
one of them a girl?", with the other conditions unchanged?


Solution


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