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From 5 men and 5 women, 3 persons are to be selected with at least 1 woman. How many selections are possible?

Answer and explanation

Correct answer: 110

This is a combinations problem because a group of three people is selected and the order of its members is irrelevant. There are 10 people in total, so unrestricted selections number C(10,3) = 10!/(3!7!) = 120. The phrase “at least 1 woman” rules out only the selections containing three men. Since there are 5 men, the number of excluded groups is C(5,3) = 10. Thus valid selections are C(10,3) − C(5,3) = 120 − 10 = 110. Therefore option C is correct. Equivalently, the cases of one, two, and three women give C(5,1)C(5,2) + C(5,2)C(5,1) + C(5,3) = 50 + 50 + 10 = 110. Option D is the unrestricted total and includes invalid all-men groups.

Related tags

CombinationsComplement MethodGroup SelectionClass11Permutations And CombinationsMathematicsClass 11 Mcq

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