H. E. Dudeney, Amusements in Mathematics (1917) No. 93 · Puzzles · Arithmetical puzzles
The Mystic Eleven
Can you find the largest possible number containing any nine of the ten digits (calling nought a digit) that can be divided by 11 without a remainder? Can you also find the smallest possible number produced in the same way that is divisible by 11? Here is an example, where the digit 5 has been omitted: 896743012. This number contains nine of the digits and is divisible by 11, but it is neither the largest nor the smallest number that will work.
H. E. Dudeney, Amusements in Mathematics (1917) · No. 93
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