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In a league of (11) teams, if each team plays every other team once, how many matches will be played?

Answer and explanation

Correct answer: 55

Each match is determined by a pair of distinct teams. Therefore, the number of matches equals the number of ways to choose 2 teams from 11: \(\binom{11}{2}=\frac{11\times10}{2}=55\). Hence, option B is correct. Counting 110 would count every match twice, such as A versus B and B versus A. Exam tip: for a single round-robin league with \(n\) teams, total matches are \(\binom{n}{2}\).

Related tags

CombinationsRound Robin LeagueTeam PairsClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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