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In a row arrangement of (8) distinct persons, if the first particular person must be before the second particular person and the third particular person must be before the fourth particular person, how many arrangements are possible?

Answer and explanation

Correct answer: (10080)

Out of total (8!) arrangements, each independent order condition keeps half the arrangements. Hence the answer is (\frac{8!}{2\cdot2}=10080).

Related tags

PermutationsOrder RestrictionLinear ArrangementPermutations And CombinationsMathematicsClass 11 Mcq

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