In a cricket championship, there are 21 matches. If each team plays one match with every other team, the number of teams is A. 7 B. 9 C. 10 D. None of these Answer Workspace Report Discuss Answer with explanation Answer: Option A Explanation Let n be the number of teams. nC2 = 21 (n(n-1)/2) = 21 ⇒ n(n-1) = 42 ∴ ⇒ n = 7 Workspace
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