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In a row of (12) people, how many arrangements have (4) particular people together in a prescribed internal order?

Answer and explanation

Correct answer: (362880)

Treat the four specified people as one block with fixed internal order, so (9) units arrange in (9!) ways. If internal order is prescribed, do not multiply by (4!).

Related tags

PermutationsBlock MethodPrescribed OrderPermutations And CombinationsMathematicsClass 11 Mcq

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