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My favorite numbers (Posted on 2005-07-22) Difficulty: 3 of 5
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.

No Solution Yet Submitted by Jurgen    
Rating: 3.5000 (6 votes)

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Some Thoughts First part | Comment 1 of 13
a=1, b=5, c=2, d=3
  Posted by Nosher on 2005-07-22 03:40:43
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