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Friday 12 September 2014

Quiz 62

How many squares, of any size, do not contain a Rook?



Answer: 128.

There are 62 squares of size 1x1
There are 41 squares of size 2x2
There are 18 squares of size 3x3
There are  6 squares of size 4x4 
There is   1 square  of size 5x5

A total of 62 + 41 + 18 + 6 + 1 = 128

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