Braingle: rec.puzzles Hall of Fame

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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 : gerrymander.p

You have two urns and 100 marbles, 50 white and 50 black.  You wish to
maximize the odds that someone picking a marble at random from one of
the urns will pick a black marble.  How do you do so, and what are the
maximum odds?

Solution

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