P and Q are integers that between them contain each of the digits from 0 to 9 once and only once. What is the

P and Q are integers that between them contain each of the digits from 0 to 9 once and only once. What is the maximum value of P x Q?

96420 x 87531 = 8439739020

You want the numbers to be roughly equal in value, and have the largest number in the most significant positions. Then some experimentatoin with 97 * 86 v. 96*87 gives that result. (I havent proved this so it is possible that a larger solution exists.)

So P and Q and single digiits, right? So i quess the max is 9 * 9 which is 81. THe lowest being 0.