SOLUTION: The interiors of all the unit squares of a 10 by 10 board are to be painted. Any two squares that have a side in common will be painted with a different colour of paint. What is th
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Question 1166110: The interiors of all the unit squares of a 10 by 10 board are to be painted. Any two squares that have a side in common will be painted with a different colour of paint. What is the least number of colours that will be needed? Answer by ikleyn(52780) (Show Source):