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A 5-member committee is to be formed from 8 women and 7 men. If the committee must contain at least 3 women, which expression correctly represents the number of such committees?

Answer and explanation

Correct answer: \(\binom{8}{3}\binom{7}{2}+\binom{8}{4}\binom{7}{1}+\binom{8}{5}\)

There are three mutually exclusive cases: exactly 3, 4, or 5 women. Multiply the choices of women and men in each case, then add the results. Option B counts committees with at least one woman, not at least three. Exam tip: for “at least,” list every allowed case before forming the sum.

Related tags

CombinationsCommittee SelectionAt Least ConditionCasewise CountingPermutations And CombinationsMathematicsClass 11 Mcq

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