DR MATHS.(Features)

From: Evening Chronicle (Newcastle, England) | Date: February 7, 2008 | Copyright information

Byline: DR MATHS

DEAR Dr Maths,

Here is a puzzle for you. Lay out 16 coins randomly in a four-by-four grid, so that some have heads facing up and others tails. The object of the game is to turn over the coins until all show heads or all show tails. The coins are flipped according to the simple rule that at each turn you must flip all the coins in a single row, column ...

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