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How many squares, of any size, can you find on this chessboard that do not contain a rook?
Puzzle Copyright © Kevin Stone
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Answer
125.
Reasoning
There are 61 squares of size 1x1.
There are 39 squares of size 2x2.
There are 20 squares of size 3x3.
There are 5 squares of size 4x4.
A total of 61 + 39 + 20 + 5 = 125.
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