Making the greatest and the smallest 5-digit numbers using different digits
Digits are 0,1,2,3,4,5,6,7,8,9
5 always appear at ten's place = _ _ _ 5 _
For greatest number place 9 at the highest place value and then 8 and 7 and in units place 6.
Therefore the greatest number is 98756
Now for smallest number take the digit 1, as a number cannot start with 0
Then write 0 and 2 in the next places and 3 in units place.
Therefore the smallest number is 10253
Hence, the greatest and least 5-digit numbers are 98756 and 10253 respectively.