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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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