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From (9) men and (7) women a committee of (6) persons is to be formed with exactly (2) men. How many ways are there?

Answer and explanation

Correct answer: 1260

Exactly 2 men must be selected, so the remaining 4 committee members must be women. The number of ways to choose 2 of the 9 men is \(\binom{9}{2}=36\), and the number of ways to choose 4 of the 7 women is \(\binom{7}{4}=35\). Hence, the total number of committees is \(\binom{9}{2}\binom{7}{4}=36\times35=1260\). Therefore, option C is correct. Exam tip: When “exactly” is specified, choose the required members from each group separately and multiply the results.

Related tags

CombinationsCommittee SelectionBinomial CoefficientClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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