Answer:
900 different combinations.
Step-by-step explanation:
He always where a shirt, pant, a pair of socks, and a pair of shoes. This type of question is asking for the amount of different ways he can wear the outfits. To do so, simplify just multiply all the numbers together:
12 x 3 x 5 x 5 = 36 x 25 = 900
There are 900 different combinations he can wear.
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