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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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From (9) questions (5) are to be solved but at least (1) of the first (2) questions must be solved. How many selections are possible?

Answer and explanation

Correct answer: (119)

Total selections are (\binom{9}{5}=126) and selections with none of the first (2) are (\binom{7}{5}=21). Thus the valid selections are (105).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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