Complete the series: 30, 18, 15, 7, ?
- 3
- 4
- 5
- None of these
Explanation
The pattern is:
30 → 18 (−12)
18 → 15 (−3)
15 → 7 (−8)
7 → 4 (−3)
The subtraction alternates with a larger number and −3:
−12, −3, −8, −3
So, the next number is:
7 − 3 = 4
Last verified on 11-07-2026
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