Question 15
In $\overline{AB}\times\overline{BA}=\overline{57B}$, A and B are different digits, $\overline{AB}$ and $\overline{BA}$ are two-digit numbers, and $\overline{57B}$ is a three-digit number. If $\overline{AB}<\overline{BA}$, what is $\overline{AB}$?
