Question 3
Let $A$ be the set of natural numbers satisfying both conditions:
The sum of the digits of each number is $18$.
The digits within each number are all distinct.
Let $D$ be the difference between the largest and smallest numbers in $A$. Find the sum of the digits of $D$.
The sum of the digits of each number is $18$.
The digits within each number are all distinct.
Let $D$ be the difference between the largest and smallest numbers in $A$. Find the sum of the digits of $D$.