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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.

   
rec.puzzles
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FAQ
Hall of Fame
alt.brain.teasers
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FAQ
Categories : probability : particle.in.box.p

A particle is bouncing randomly in a two-dimensional box.  How far does it
travel between bounces, on average?

Suppose the particle is initially at some random position in the box and is
traveling in a straight line in a random direction and rebounds normally
at the edges.


Solution

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