Complete the series: 3, 9, 15, _____, 27, 33.
- 18
- 21
- 24
- 30
Explanation
Add 6 to each number.
3 + 6 = 9
9 + 6 = 15
15 + 6 = 21
21 + 6 = 27
27 + 6 = 33
Last updated by NA on 04-11-2026
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