80.--THE THREE GROUPS.

From Amusements in Mathematics by Henry Ernest Dudeney.

There are nine solutions to this puzzle, as follows, and no more:--

12 × 483 = 5,796 27 × 198 = 5,346 42 × 138 = 5,796 39 × 186 = 7,254 18 × 297 = 5,346 48 × 159 = 7,632 28 × 157 = 4,396 4 × 1,738 = 6,952 4 × 1,963 = 7,852

The seventh answer is the one that is most likely to be overlooked by solvers of the puzzle.

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80.--THE THREE GROUPS.: Amusements in Mathematics by Henry Ernest Dudeney | amphi