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A league has 15 teams, and 2 matches are played between every pair of teams. How many matches will be played?

Answer and explanation

Correct answer: 210

Use combinations because each match-up is an unordered pair of distinct teams. The number of pairs among 15 teams is C(15, 2) = 15 × 14 ÷ 2 = 105. The statement says that each such pair plays 2 matches, so the total number of matches is 105 × 2 = 210. Hence option B is correct. Option A is the number of pairs and would be correct only if teams met once. Options C and D do not result from multiplying the correct pair count by the stated two matches, so they overcount or use an unrelated calculation.

Related tags

CombinationsLeague MatchesPair CountingPermutations And CombinationsMathematicsClass 11 Mcq

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