Discussion
A boy has nine trousers and 12 shirts. In how many different ways can he select a trouser and a shirt?
Answer: D
The two choices are independent, so they multiply.
\[ 9 \times 12 = 108 \]
Each of the nine trousers can be paired with each of the twelve shirts. Adding them would answer a different question - how many garments he could pick one of.
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