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 Solution
Sorry i'm new here but can someone explain how A+B<A*B and C+D<C*D leads to A+B<C+D<A+B ? Cheers
Posted by Percy
on 2005-08-19 08:05:07