JEE MATHEMATICS MCQ: PERMUTATIONS

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There are 20 persons among whom two are brothers. The number of ways in which we can arrange them around a circle so that there is exactly one person between the brothers is

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Correct option: B

2 \times 18

Option B (

2 \times 18 !

) is correct because it accounts for arranging the remaining people and the two possible arrangements of the brothers.

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