Discussion
1, 2, 3, 6, 9, 18, ?, 54
Answer: B
Correct answer: 27
The series alternately doubles and adds the term before that: \( 1\times2=2 \), \( 2+1=3 \), \( 3\times2=6 \), \( 6+3=9 \), \( 9\times2=18 \), so next \[ 18 + 9 = \mathbf{27} \] and \( 27 \times 2 = 54 \), as shown.
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