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(2): another

| Comment 9 of 21 |

(In reply to re: another by broll)

But

natural numbers = integers.

Posted by Ady TZIDON on 2013-04-28 15:25:55

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