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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.

   
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Categories : combinatorics : gossip.p

n people each know a different piece of gossip.  They can telephone each other
and exchange all the information they know (so that after the call they both
know anything that either of them knew before the call).  What is the smallest
number of calls needed so that everyone knows everything?


Solution

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