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Class 11MathematicsPermutations and CombinationsCombinationsExpert
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From (20) students, (6) are to be chosen. Exactly one of two special students must be selected. How many selections are possible?

Answer and explanation

Correct answer: (18144)

Choose (1) of the two special students and (5) from the remaining (18). The number is (^{2}C_{1}{}^{18}C_{5}=17136).

Related tags

Exactly-OneSelectionCombinationsPermutations And CombinationsMathematicsClass 11 Mcq
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