H. E. Dudeney, Amusements in Mathematics (1917) No. 286 · Puzzles · Logic
Painting the Die
In how many different ways may the numbers on a single die be marked, with the only condition that the 1 and 6, the 2 and 5, and the 3 and 4 must be on opposite sides? It is a simple enough question, and yet it will puzzle a good many people.
H. E. Dudeney, Amusements in Mathematics (1917) · No. 286
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