Multiple choice general knowledge math & puzzles Find the next number in the series 1,6,12,20... 29 28 30 32 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The pattern is n×(n+1) where n shifts: 1×1=1, 2×3=6, 3×4=12, 4×5=20, so next is 5×6=30. Each term is the product of consecutive integers.