JEE MATHEMATICS MCQ: PERMUTATIONS

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A round table conference is to be held between 20 delegates of 2 countries. In how many ways can they be seated if two particular delegates are always together

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Correct option: D

18 ! \times 2 !

Option D (

18 ! \times 2 !

) is correct because treating the two delegates as one unit leaves 19 units to arrange in a circle (18!), and the two delegates can switch places (2!).

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