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What is the expression for a 5-member committee with exactly 3 boys from 7 boys and 6 girls?

Answer and explanation

Correct answer: ⁷C₃ × ⁶C₂

The governing idea is combinations, because a committee is selected without regard to order. Exactly 3 of the 7 boys must be chosen, which can be done in ⁷C₃ ways. The committee has 5 members, so the remaining 2 members must be selected from the 6 girls in ⁶C₂ ways. By the multiplication principle, the required expression is ⁷C₃ × ⁶C₂, option A. Option B allows any composition of the committee and does not enforce exactly 3 boys. Option C counts ordered selections, which is inappropriate for a committee, while option D selects the wrong numbers of boys and girls.

Related tags

CombinationsCommitteeExact SelectionPermutations And CombinationsMathematicsClass 11 Mcq

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