Black hole in Mathematics.......

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suppose we start with any natural number lets say 4599874 , count even digits then count odd digits n then sum of even n odd digits. here 3(even)4(odd)7(total) so no is 347 again for that no find even,odd n sum i.e 1(even)2(odd)3(total) (consider 0 as even) (if 0 considered odd you will get another black hole) the final answer always is 123 n that's the one block hole in maths. Try for any number........