6174 is known as Kaprekar's constant after the
Indian mathematician
D. R. Kaprekar.
This number is special because if we Take any four-digit number, using at least two different digits. (Leading zeros are allowed.) and Arrange the digits in descending and then in ascending order to get two four-digit numbers.
Then if we Subtract the smaller number from the bigger number and Go back to step 2 and repeat we will eventually get this magical number 6174
sourse :-
https://en.wikipedia.org/wiki/6174_(number)
#maths
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