Find 4 different positive integers A,B,C,D for which:
A+B = C*D and
A*B = C+D
How many sets of 4 numbers can you find? Prove that only those sets exist.
(In reply to First part
...and the other 7 combinations of these 4 numbers.
Posted by Nosher
on 2005-07-22 03:43:47