Discussion
Insert the missing number 8, 24, 12, 36, 18, 54, (....)
Answer: A
The operations alternate between multiplying by 3 and halving.
\[ 8 \times 3 = 24,\quad 24 \div 2 = 12,\quad 12 \times 3 = 36,\quad 36 \div 2 = 18,\quad 18 \times 3 = 54 \]
\[ 54 \div 2 = \mathbf{27} \]
Continuing with a multiplication instead would give 162; the alternation is what makes the next step a division.
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