> But I think every arrangement of these numbers (without having tested all of them), will be a multiple of 9. So did I just find out something we didn't learn in school? That if the digit sum of a number is a multiple of 9, the number will also be?

Actually, I DID learn this in school. It is always true that a number whose digits sum to nine is a multiple of nine. I think Tubba said the same thing, but I'm tired, so I won't check.

> Trav"likes to juggle numbers but lacks the knowledge to deduce things like this on his own"holt.

Don "Knew this rule before the one for determining if a number is divisible by three, actually" Monkey