Divide the ten checks into the following three groups: 7 1 5--4 6--3 2 8 9 0, and the first multiplied by the second produces the third.
87.--THE NUMBER CHECKS PUZZLE.
From Amusements in Mathematics by Henry Ernest Dudeney.
From Amusements in Mathematics by Henry Ernest Dudeney.
Divide the ten checks into the following three groups: 7 1 5--4 6--3 2 8 9 0, and the first multiplied by the second produces the third.