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Subjects
Class 11MathematicsPermutations and CombinationsFundamental principle of countingHard
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Using letters (A,B,C,D,E,F), how many (4)-letter words can be formed without repetition such that (A) is included but (B) is not included?

Answer and explanation

Correct answer: (96)

Choose (3) letters from (C,D,E,F) along with (A), then arrange the (4) letters in (4!) ways. Apply inclusion and exclusion restrictions first.

Related tags

LettersRestrictionPermutationsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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