Discussion
6, 12, 21, ?, 48
Answer: A
Correct answer: 33
The gaps rise by three each time: \( 12-6=6 \), \( 21-12=9 \), then 12 and 15. So the missing term is \[ 21 + 12 = \mathbf{33} \] and \( 33 + 15 = 48 \), as shown.
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