There are 8 classes in the school to participate in tug-of-war. If the single round robin system is adopted, how many games will be arranged for one * * *?

If the single round robin system is adopted, there will be 7 games in a class and 4 games in a round, and 28 games will be arranged.

Arrangement method:

The first round: 1-2 3-4 5-6 7-8

The second round: 1-3 2-4 5-7 6-8

The third round: 1-4 2-3 5-8 6-7

The fourth round: 1-5 2-6 3-7 4-8

Round 5: 1-6 2-5 3-8 4-7

Round 6: 1-7 2-8 3-5 4-6

Round 7: 1-8 2-7 3-6 4-5