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A tournament has 12 teams, and 2 matches are played between every pair of teams. How many matches will be played?

Answer and explanation

Correct answer: 132

The governing concept is combinations used to count unordered pairs. A match is associated with a pair of teams, and the pair Team A–Team B is the same as Team B–Team A. Thus the number of distinct team pairs among 12 teams is C(12,2) = 12×11/2 = 66. The question states that each pair plays 2 matches, so multiply by 2: 66×2 = 132. Therefore option C is correct. Option A counts only one match per pair and omits the second match. Options B and D do not result from the correct pair count multiplied by the specified two matches. Counting ordered pairs would also double-count the identity of each pair before applying the two-match condition.

Related tags

CombinationsTournament CountingPair SelectionClass11Permutations And CombinationsMathematicsClass 11 Mcq

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