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From 7 men and 3 women, in how many ways can 1 man and 2 women be selected?

Answer and explanation

Correct answer: 21

The governing concept is combination with independent category requirements. First select 1 man from 7, which can be done in 7C1 = 7 ways. Then select 2 women from 3, which can be done in 3C2 = 3!/(2!1!) = 3 ways. By the multiplication principle, the total number of complete selections is 7C1 × 3C2 = 7×3 = 21. Hence option B is correct. Option A adds the group sizes instead of combining the two required choices. Option C doubles the correct result and does not follow either combination or multiplication calculation. Option D is 3 times the correct result. Since only membership of the selected group matters, no permutation factor is needed.

Related tags

CombinationsMultiplication-PrincipleSelectionClass11Permutations And CombinationsMathematicsClass 11 Mcq

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