What number comes next in the series 3, 27, 7, 24, 11, 21, ...?
Answer and explanation
Correct answer: D. 15
- Step 1: Two patterns alternate. The odd positions rise by 4 (3, 7, 11) so the next odd-position term is 15. Answer: 15. Why not the others: 18, 11 and 19 don't fit.
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