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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.

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Categories : combinatorics : color.p

An urn contains n balls of different colors.  Randomly select a pair, repaint
the first to match the second, and replace the pair in the urn.  What is the
expected time until the balls are all the same color?

Solution

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