In a sports competition, 10 teams play league matches. If each team plays against every other team once only then how many matches are played?
Q1. In a sports competition, 10 teams play league matches. If each team plays against every other team once only then how many matches are played?
Answer: 45
Explanation: With 10 teams each playing every other team once, the number of matches equals C(10,2) = 10×9/2 = 45.