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Dark Divisibility (Posted on 2013-04-27) Difficulty: 3 of 5
The natural numbers a,b,c,d are such that their least common multiple equals a+b+c+d. Prove that abcd is divisible by 3 or by 5.

No Solution Yet Submitted by Danish Ahmed Khan    
Rating: 5.0000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: No Subject | Comment 6 of 18 |
(In reply to No Subject by xdog)

You are quite correct. I have made a note on my earlier comment accordingly.
  Posted by broll on 2013-04-28 10:06:33

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