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A student has (3) shirts and (4) trousers. In how many ways can one shirt and one trouser be chosen?

Answer and explanation

Correct answer: (12) ways

This uses the fundamental principle of counting. The choice is made in two successive stages: first select one shirt, which can be done in 3 ways, and then select one trouser, which can be done in 4 ways. Each shirt can be paired with each trouser, so the total number of complete outfits is 3 × 4 = 12. Therefore, option B is correct. Addition, 3 + 4 = 7, would count alternatives when only one item is selected, not a shirt-and-trouser pair. The value 9 has no applicable counting basis, and 24 would require more choices than the two given stages.

Related tags

Fundamental Principle Of CountingMultiplication PrincipleCombinationsPermutations And CombinationsMathematicsClass 11 Mcq

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