Tuesday 17 March 2009

Combinatorics and parties of six or more people

A branch of mathematics known as combinatorics shows us that if we go to any party with six or more people, there must be either three who are mutual acquaintances or three who are mutual strangers. Try it the next time you're in a group of six.

See http://www.bbc.co.uk/dna/h2g2/A46904600

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