KöMaL 2009 B4223
Consider the number pairs (1,36), (2,35), ..., (12,25). Is it possible to select one number from each given pair, such that the sum of the numbers selected equals the sum of the numbers not selected? Will the answer change if the last two pairs are left out? (Suggested by J. Pataki, Budapest)
Official text KöMaL. Quoted with source.
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