Carlton wears an assortment of sweater vests and button-up shirts. He has twice as many sweater vests as button-up shirts and considers each unique combination of vest and shirt to be an outfit. He owns three button-up shirts. How many outfits does Carlton have? Let's think first. Chain of thought:
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Carlton has 2 * 3 = 6 sweater vests. He can wear each sweater vest with different 3 button - up shirts, so Carlton has 3 * 6 = 18 outfits.
Therefore, the answer is 18.
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