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Class 11MathematicsPermutations and CombinationsCombinationsMedium
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From (6) different pens and (5) different pencils (4) objects are to be selected with at least (1) pen and (1) pencil. How many ways are there?

Answer and explanation

Correct answer: (305)

Total ways are (\binom{11}{4}=330). Removing only pens (\binom{6}{4}=15) and only pencils (\binom{5}{4}=5) gives (310) ways.

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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