Relocation, lottery, evacuation.

Question 10 people took part in the table tennis competition. In the round robin (two people play one game), 5 people were eliminated by points and entered the semi-finals. In the rematch, two people were randomly selected for elimination?

: 10 people need 45 games to complete the single-cycle preliminary round; With the score of 10, five people were eliminated and entered the semi-finals, which means that there are still five people left to enter the next stage of the single knockout, and it takes four games for the five-person single knockout to decide the third place in the championship. The above refers to a champion and a runner-up, tied for third and third place.

The landlord's problem is: 10 people need 45 games to complete the single-cycle preliminary round; There are four people left to play three games in the semi-final. (2 semi-finals, 1 final).

Calculation formula: single cycle time

( 10 - 1 )X 10

-= 45 games.

2

Count the number of games in a single knockout (referring to the number of games needed to decide the champion)

Team (person)-1 = number of games.

In the five-person single elimination, there is only one game (two players) in the first round, and the other three players automatically enter the top four by bye. Specifically, three bye-bye numbers are drawn by five people, and whoever draws the bye-bye number will be lucky. I think it's best for people with 10 to press the integral directly before the exam. There is no need to report to the semi-finals, because they have already played in the round robin, and there are too many times. Generally, the method of first single cycle and then cross elimination is adopted, which is suitable for dividing into several groups first, and the first few groups will appear, and the next stage will adopt the system of cross elimination, semi-finals and finals.

I don't know if the above is actual planning or what exam questions. Just expressing my personal opinion. For reference!