Find the difference between the greatest and the smallest four-digit numbers formed by using all the digits 8, 6, 7 and 4.

Find the difference between the greatest 5-digit number and the greatest 4-digit number formed using the digits 7, 6, 2, 5, 1 when the repetition is not allowed.

Find the difference between the greatest and the least 5-digit number that can be written using the digits 6, 2, 7, 4, 3 each only once.

Now make the greatest and the smallest four digit numbers by using any one digit twice. 3,8,7

The difference between the greatest and the smallest numbers formed by all the digits 2, 3, 5, and 7 is XYZX, where X, Y, Z are digits, then X is___.

Find the difference between the greatest and smallest numbers formed with the digits 4,0,5,9,3.

Now make the greatest nad the smallest four digit numbers by using any one digit twice. 8,5,1.