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Dozen Divisibility Dilemma (Posted on 2010-12-02) Difficulty: 3 of 5
Each of x and y is a positive integer such that: x2 5y2 = 1.

Prove that x*y is always divisible by 12.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
re(2): Possible solutionbroll2010-12-04 00:15:06
Some Thoughtsre: Possible solutionHarry2010-12-03 21:26:03
Solutionre: Possible solutionJer2010-12-03 17:52:28
Some ThoughtsPossible solutionbroll2010-12-03 04:49:42
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