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From 4 boys and 3 girls, in how many ways can 1 boy and 1 girl be selected?

Answer and explanation

Correct answer: 12

This is a combination problem because selection is involved and the order in which the chosen boy and girl are named does not create a new selection. Choose one boy from four in C(4,1) = 4 ways, and choose one girl from three in C(3,1) = 3 ways. Since these choices come from independent groups, apply the multiplication principle: C(4,1) × C(3,1) = 4 × 3 = 12. Therefore option B is correct. The value 7 merely adds the group sizes and does not count pairs; 24 counts an inappropriate ordering; and 1 ignores the different possible choices.

Related tags

CombinationsMultiplication PrincipleClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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