Monthly Archives: May 2011

6 persons inside an elevator – the math

Prove that if 6 persons are inside an elevator then there is a subgroup of 3 persons that know each other or a subgroup of 3 persons that don’t know each other. Note: for this problem if A  knows B then … Continue reading

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6 persons inside an elevator – algorithm

Prove that if 6 persons are inside  an elevator then there is a subgroup of 3 persons that know each other or a subgroup of 3 persons that don’t know each other. Note: if A  knows B then B also knows … Continue reading

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