Međunarodna matematička olimpijada - Shortlist 1961

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1154IMO Shortlist 1961 problem 13
1155IMO Shortlist 1961 problem 21
1156IMO Shortlist 1961 problem 31
1157IMO Shortlist 1961 problem 41
1158IMO Shortlist 1961 problem 51
1159IMO Shortlist 1961 problem 61