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How to prove that there must be two distinct integers in A whose sum is 104?

+1 vote
Let A be any set of 20 distinct integers chosen from the academic progression 1,4,7,...100. Prove that there must be two distinct integers in A whose sum in 104.
asked Jul 10, 2014 in Math by luongamanda Evoker (610 points)  
retagged Aug 4, 2014 by luongamanda

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