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Permanent link to this puzzle: mscroggs.co.uk/puzzles/advent2017/4

Pick a three digit number whose digits are all different.

Sort the digits into ascending and descending order to form two new numbers. Find the difference between these numbers.

Repeat this process until the number stops changing. The final result is today's number.

If you enjoyed this puzzle, check out Sunday Afternoon Maths LXII,

puzzles about square roots, or a random puzzle.

puzzles about square roots, or a random puzzle.