Prove that at a party of 25 people there is one person knows at least twelve people. – math.stackexchange.com

Prove that at a party of 25 people there is one person knows at least twelve people. – math.stackexchange.com

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So, the full problem goes like this: There are 25 people at a party. Assuming that among any three people, at least two of them know each other, prove that there exists one person who must know at ...

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