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Yes, but just remember that it will only have one structure in the end. By definition, a ketone must be located inside of the carbon chain. Therefore, it can only be at positions 2 or 3. Since the chain is only four carbons long, 2-butanone is the exact same as 3-butanone. Since there is only one possible structure of 2-butanone, the number is dropped bc it is redundant.
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