A boy has nine trousers and 12 shirts. In how many different ways can he select a trouser and a shirt?
Correct answer: D. 108
- A. 21
- B. 12
- C. 9
- D. 108
Explanation
Each of the 9 trousers can be paired with any of the 12 shirts, so the multiplication principle gives 9 x 12 = 108 different selections. The likely mistake is choosing 21 by adding the trousers and shirts instead of counting every possible pairing.
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