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From 5 boys and 4 girls, in how many ways can 2 boys and 2 girls be selected?

Answer and explanation

Correct answer: 60

This problem uses combinations together with the multiplication principle. First choose the required two boys from five: C(5,2) = 5!/(2!3!) = 10. Independently, choose two girls from four: C(4,2) = 4!/(2!2!) = 6. Every valid pair of boys can be combined with every valid pair of girls, so the total number of four-student groups is the product 10 × 6 = 60. Therefore option C is correct. Addition would be inappropriate because both selections must occur together. Option A omits the girls’ choices, option B does not equal the required product, and option D overcounts by treating the selected students as ordered or by using an incorrect arrangement method.

Related tags

CombinationsMultiplication-PrincipleGroup-SelectionCountingPermutations And CombinationsMathematicsClass 11 Mcq

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