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Class 11MathematicsPermutations and CombinationsCombinationsMedium
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From (7) subjects (4) subjects are to be selected but mathematics and chemistry cannot both be selected together. How many ways are there?

Answer and explanation

Correct answer: (25)

Total ways are (\binom{7}{4}=35) and if both special subjects are included there are (\binom{5}{2}=10) ways. Hence (35-10=25).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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