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D.R. Kaprekar discovered a number that almost any four-digit number reaches, within 7 steps, through a repeated digit-rearrange-and-subtract process. What is this number, now called Kaprekar’s Constant?

1. D.R. Kaprekar discovered a number that almost any four-digit number reaches, within 7 steps, through a repeated digit-rearrange-and-subtract process. What is this number, now called Kaprekar’s Constant?

 

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