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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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alt.brain.teasers
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FAQ
Categories : probability : killers.and.pacifists.s

Regardless of whether you are a pacifist or a killer, you may disregard
all events in which a pacifist other than yourself is involved and
consider only events in which you are killed or a pair of killers other
than yourself is killed.

Thus we may assume that there are N killers and yourself.  If N is odd,
your odds of surviving are zero.  If N is even, it doesn't matter to
you whether you are a killer or not.  So WLOG assume you are.  Then your
probability of survival is 1/(N+1).


Solution


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