What is the next number in the series: 2, 6, 12, 20, 30, ?
Q1. What is the next number in the series: 2, 6, 12, 20, 30, ?
Answer: 42
Explanation: Differences: +4, +6, +8, +10 → next difference +12. 30 + 12 = 42. ISSB loves simple increasing-difference series.