Multiple choice general knowledge math & puzzles What is the missing number in this series? 8 2 14 6 11 ? 14 6 18 12 16 9 15 6 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The series consists of two alternating patterns. Pattern 1: 8, 14, 11, 14, 18 (inconsistent). Pattern 2: 2, 6, ?, 6, 12. However, looking at pairs: 8-2=6, 14-6=8, 11-?=2, 14-6=8, 18-12=6. The missing number is 9.