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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
Newsgroup
FAQ
Categories : probability : lights.p

Waldo and Basil are exactly m blocks west and n blocks north from
Central Park, and always go with the green light until they run out of
options.  Assuming that the probability of the light being green is 1/2
in each direction, that if the light is green in one direction it is
red in the other, and that the lights are not synchronized, find the
expected number of red lights that Waldo and Basil will encounter.


Solution
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