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(8) distinct people are seated in a row. If (A) and (B) sit together and (C) and (D) also sit together, how many arrangements are possible?

Answer and explanation

Correct answer: (2880)

Treat (AB) and (CD) as two blocks; (6) objects can be arranged in (6!) ways and the blocks internally in (2!\times2!) ways. Exam tip: with multiple blocks, count each block's internal order.

Related tags

PermutationsBlock MethodMultiple PairsClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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