SOLUTION: What is the smallest whole number you can make whose digits are all different numbers and the sum of the digits is 21

Question 917967: What is the smallest whole number you can make whose digits are all different numbers and the sum of the digits is 21
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
I will need at least 3 digits because is the greatest number than I can make with just 2 different digits.
Since the same digit has a value 10 times greater than the same digit to its right,
we want to make the first and second digits as small as possible, at the expense of increasing the digits to their right.
As a consequence we would make the last digits 89,
with ,which would require a for a hundreds digit.
So, the smallest whole number you can make whose digits are all different numbers and the sum of the digits is 21, is .
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