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2001 IMO Problems/Problem 6

Revision as of 12:38, 17 March 2013 by MSTang (talk | contribs)

6. $K > L > M > N$ are positive integers such that $KM + LN = (K + L - M + N)(-K + L + M + N)$. Prove that $KL + MN$ is not prime.

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