Question 6
In a three-digit number $\overline{XYZ}$, the nonzero digits $X,Y,Z$, in that order, form an arithmetic progression. If $\overline{XYZ}-\overline{ZXY}=M$, find the largest three-digit value of $M$.
The overline denotes a decimal number, not a product. Enter the integer $M$.
The overline denotes a decimal number, not a product. Enter the integer $M$.