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#1 2008-02-24 19:58:47

tony123
Member
Registered: 2007-08-03
Posts: 229

seven people

Each person in a group of seven people speaks at most two languages, while among every three of them there are at least two who can communicate. Prove that there are three people who speak a common language.

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#2 2008-02-24 23:02:59

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: seven people


Why did the vector cross the road?
It wanted to be normal.

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