Products of 2-Digit Pairs which Reversed reveal Same Product/Mistake

Source Work

 * The Dictionary
 * $504$
 * $504$


 * The Dictionary
 * $504$
 * $504$

Mistake

 * $504$ is equal to both $12 \times 42$ and $21 \times 24$. There are thirteen such $2$-digit pairs, the largest being $36 \times 84 = 63 \times 48 = 3024$.

There are in fact $14$ such, the largest being $4416 = 46 \times 96 = 64 \times 69$.