What number comes next in the series 9, 39, 12, 36, 15, 33, ...?
Answer and explanation
Correct answer: C. 18
- Step 1: Two patterns alternate. The odd positions rise by 3 (9, 12, 15) so the next odd-position term is 18. Answer: 18. Why not the others: 30, 15 and 21 don't fit.
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