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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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From (7) distinct letters (3) letters are to be selected containing (a) but not (b). How many ways are there?

Answer and explanation

Correct answer: (10)

The letter (a) is fixed and (b) is excluded so choose the remaining (2) letters from (5). The ways are (\binom{5}{2}=10).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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