Rory Sutherland Rory Sutherland

Learning to say ‘I don’t know’

issue 13 October 2012

An evil wizard has captured 15 dwarves of rare mathematical genius. He informs them that, the following day, he will make them stand in a circle and then from behind will place a hat, randomly either black or white, on each of their heads. He will then go to the dwarves in turn and ask each to state the colour of his hat.

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