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The (8) distinct letters (A,B,C,D,E,F,G,H) are to be arranged in a row. The letters (A), (B), (C) must appear in this relative order, and (D) must not be at either end. How many arrangements are possible?

Answer and explanation

Correct answer: (5040)

First divide (8!) by (3!) for the relative order of (A,B,C), then subtract cases where (D) is at an end. Relative orders are equally distributed.

Related tags

LettersRelative-OrderRestrictionFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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