Mathematical Mystery

0
1.Take any four digit number say-1234
2.Reverse the order of digits-4321
3.subtract 4321 to1234.
4.Take mode of the result
5.The result is 3087
6.Add these digits 3+0+8+7.
7.We get the result 18.
8.Again add these digits :1+8.
9.The resulting number is 9.

We can apply the above steps with any four digit number , we get the result as same :

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