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Among arrangements of letters (A,B,C,D,E,F), how many have (B) always appearing after (A)?

Answer and explanation

Correct answer: (360)

In the total (6!) arrangements, the two orders of (A) and (B) are equally likely, so half are valid. Symmetry saves time in order-condition questions.

Related tags

PermutationsOrder ConditionSymmetryPermutations And CombinationsMathematicsClass 11 Mcq

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