THE FORTY-NINE COUNTERS
Can you rearrange the above forty-nine counters in a square so that no letter, and also no number, shall be in line with a similar one, vertically, horizontally, or diagonally? Here I, of course, mean in the lines parallel with the diagonals, in the chessboard sense.
Sources:
- Amusements in Mathematics, Henry Ernest Dudeney Question 309
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