| 4 teams in a single round-robin tournament *** match 4 × 3 ÷ 2 = 6 games, after each game, the sum of the two teams scored either 2 points (i.e., a draw), or 3 points (with a win or loss), so the sum of the teams' scores after the 6 games is not more than 18 points, ①If a team scored 7 points, the sum of the scores of the remaining 3 teams is not more than 11 points, it is unlikely that there are two teams If a team scores 7 points and the sum of the remaining 3 teams does not exceed 11 points, it is impossible for two teams to score more than or equal to the sum of 7 points, so the team must be out of the line, ②If a team scores 6 points, it is possible that there are two other teams both scoring 6 points, and the net goal difference is more than the team, the team still can not get out of the line. B. |