I couldn't determine the original source of today's math puzzle chestnut; I've seen it in a few places, so suffice to say that it's several years old. It's still a great puzzle and a fun challenge. Good luck:

Group the digits 1-9 into a set of three 3-digit numbers,
using each digit only once in a set.

The second number should be exactly DOUBLE the first number;

and the third number should be exactly TRIPLE the first number.

There are three FOUR* possible sets of numbers that correctly
solve this puzzle; can you find one (or all of them)?

* see in comments!
Here are the SOLUTIONS.

SOLUTIONS:

192...384...576

219...438...657

273...546...819

327...654...981