In hexadecimal, the numbers would still halve, but they would do so in base 16. So the sequence would look like this:

30 (48 in decimal), 18 (24 in decimal), C (12 in decimal), ?

Halving C (12 in decimal) gives us 6 in decimal. But in hexadecimal, 6 is represented as 6.

So the next number in the sequence would be 6 (in hexadecimal).
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