Maths Permutations & Combination Definition of Permutation, Number of Permutations With or Without Repetition, Conditional Permutations Numeric Response
Published on: August 14, 2026

A cricket team consists of 10 pairs of twin brothers. On the first day of training, all 20 players stand in a circle in such a way that all pairs of twin brothers are neighbours. Numbers of ways this can be done is (k!)2 k + 1 then k equals =

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The correct answer is:
9

Ans. 9

Sol. ∴ No. of ways in which 10 pairs can stand in circle = 9! 2 10

∴ k = 9

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