The second number among the given numbers is obtained by performing arithmetical operations on the first number. The same number of operations are performed in all number group except one number group. Find out that odd number group.

4612 - 6412

THE LOGIC;

(When the digits of the first numbers are written in the descending order then we get the 2nd number)

So,

1) 4612 - 6412,

6412 in the descending order we get 6421 \(\neq \) 6412.

2) 7938 - 9873,