How many squares, of any size, can you find on this chess board which do not contain a Rook?
There are 110 squares without a rook.
There are 60 squares of size 1×1.
There are 35 squares of size 2×2.
There are 12 squares of size 3×3.
There are 3 squares of size 4×4.
A total of 60 + 35 + 12 + 3 = 110.
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