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Talk to me (Posted on 2015-09-10) Difficulty: 3 of 5
Of the 1985 people attending an international meeting, no one speaks more than five languages, and in any subset of three attendees, at least two speak a common language.

Prove that some language is spoken by at least 200 of the attendees.

Source : Balkan M.O.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
SolutionSolutionBrian Smith2017-06-30 22:14:53
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