98765
98765
Proceed from left to right, using the largest possible digit in each position.
the greatest is bigger than the smallest
99,999
172803456069120
No 5 digit number can equal 12 and so there can be no answer to the question.
10,003
99987
The smallest 5 digit odd number is: 10001 The greatest 4 digit even number is: 9998 Subtracting 9998 from 10001 gives you 3.
99999
If the numbers are not repeated then the highest 5 digit even number to be made out of 0123456789 is : 98764.
You have to specify the base. For example, in base-16, otherwise known as hexadecimal or hex, the greatest 5 digit number is FFFFF.