Find the next number: 2, 6, 12, 20, 30, ?
- 40
- 36
- 42
- 44
Show answer and solution
Correct answer: C. 42
**Differences:** 4, 6, 8, 10 (increasing by 2).
Next difference = 12. So 30 + 12 = 42. Equivalent: n(n+1) for n=1,2,3,...
giving 2, 6, 12, 20, 30, 42.