Mathematical examination questions The basketball match of a school's winter sports meeting adopts a single cycle system. There are 45 games in the first round. Do you know how many teams are taking part in the competition? The single round robin system means that all participating teams can meet once in the competition, and finally rank according to the scores and wins and losses of each team in the competition.

Number of matches: The number of matches in a single cycle can be calculated by the following formula (simple mathematical combination formula):

Number of matches = number of teams * (number of teams-1)/2 If 6 or 7 teams participate in the match, the number of matches is: 6 *(6- 1)/2 = 15 (field) 7 * (7- 1)/2 =.

So, a total of 10 teams participated!

You can set x pairs of participation equations, x(x- 1)/2=45.