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tournament 3-1-0 points, total 15 points, last 1 point, 2nd to las undefeated

Source: Dutch NMO 2001 p1

September 21, 2019
combinatoricsalgebra

Problem Statement

In a tournament, every team plays exactly once against every other team. One won match earns 33 points for the winner and 00 for the loser. With a draw both teams receive 11 point each. At the end of the tournament it appears that all teams together have achieved 1515 points. The last team on the final list scored exactly 11 point. The second to last team has not lost a match. a) How many teams participated in the tournament? b) How many points did the team score in second place in the final ranking?