A number series follows a specific rule. Given the sequence, determine which answer choice correctly continues the pattern. [ZH]

18 — The sequence 54, 9, 54, 12, 54, 15, 54, ? uses two interleaved tracks. Odd positions (1st, 3rd, 5th, 7th) are all 54. Even positions (2nd, 4th, 6th, 8th) follow 9, 12, 15, ? — each increasing by 3. The next even-position term is 15 + 3 = 18.

Number SequencesMedium

Number Sequence: 54 9 54 12 54 15 54 — What Comes Next? (中文)

The sequence 54 9 54 12 54 15 54 follows an alternating pattern. What is the next number?

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