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In how many ways can a committee of (3) members be formed from (6) members without assigning president or secretary?

Answer and explanation

Correct answer: 20

Since no positions such as president or secretary are assigned, the order of selected members does not matter. Therefore, the number of ways is \(\binom{6}{3}=\frac{6!}{3!3!}=20\). The value 120 is \(^{6}P_3\), which counts arrangements where order matters, so it is not applicable here. Exam tip: use combinations when only selection is involved and no posts are assigned.

Related tags

CombinationsCommittee SelectionClass 11 MathematicsPermutations And CombinationsOrder Not ImportantMathematicsClass 11 Mcq

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