Here is a square, a 4×4 square with 16 blank squares.
You have to select 4 squares such that no two squares comes in vertical, horizontal or diagonal to any other square.
If you were to able to do it. Now try for a 4×4 square with 25 blank squares.
You have to select 5 squares such that no two squares comes in vertical, horizontal or diagonal to any other square.
Now carry on with 6×6, 7×7 and more…
Solution for 4×4 square…
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