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Why four-digit numbers keep becoming 6174

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Kaprekar's constant is a parlor trick embedded in reality. Take any four-digit number with at least two different digits. Sort them descending, then ascending, and subtract the smaller from the larger. Repeat this exact process. Within seven steps, you will mathematically always crash into the number six thousand one hundred and seventy-four, where the loop permanently freezes. Pure numeric witchcraft.

Why four-digit numbers keep becoming 6174
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