perplexus.info :: Just Math : Dark Divisibility

Dark Divisibility (Posted on 2013-04-27)

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: 3.7500 (4 votes)

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re: No Subject

| Comment 6 of 21 |

(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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