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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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From (8) distinct letters (4) letters are to be selected containing (a) but not (b). How many ways are there?

Answer and explanation

Correct answer: (20)

The letter (a) is fixed and (b) is excluded so choose the remaining (3) letters from (6). The ways are (\binom{6}{3}=20).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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