IMO Shortlist 1988 problem 21
Dodao/la: arhiva2. travnja 2012.
Forty-nine students solve a set of 3 problems. The score for each problem is a whole number of points from 0 to 7. Prove that there exist two students
such that, for each problem,
will score at least as many points as
Izvor: Međunarodna matematička olimpijada, shortlist 1988