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From (12) men and (10) women a committee of (7) persons is to be formed with exactly (4) men. How many ways are there?

Answer and explanation

Correct answer: 59400

With exactly 4 men in the committee, the remaining 3 members must be women. There are \(\binom{12}{4}=495\) ways to choose 4 men and \(\binom{10}{3}=120\) ways to choose 3 women. Hence, the total number of committees is \(\binom{12}{4}\binom{10}{3}=495\times120=59400\). Using only \(\binom{22}{7}\) would be incorrect because it does not enforce the condition of exactly 4 men. Exam tip: For an “exactly” condition, choose separately from each group and multiply the results.

Related tags

CombinationsCommittee SelectionExactly ConditionBinomial CoefficientsClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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