Easy
Find the missing number in the series: 2, 6, 12, 20, ?, 42
Explanation
Explanation
Each term increases by consecutive even numbers: +4, +6, +8, +10, +12. So 2+4=6, 6+6=12, 12+8=20, 20+10=30, 30+12=42. The missing number is 30.
PRO TIP
Re-check your working by substituting the answer back into the original question.