IMO Shortlist 1972 problem 12
Dodao/la:
arhiva2. travnja 2012. Prove that from a set of ten distinct two-digit numbers, it is always possible to find two disjoint subsets whose members have the same sum.
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Prove that from a set of ten distinct two-digit numbers, it is always possible to find two disjoint subsets whose members have the same sum.
Izvor: Međunarodna matematička olimpijada, shortlist 1972
Školjka 
