Multiple choice general knowledge math & puzzles Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next? 7 10 12 13 Reveal answer Fill a bubble to check yourself B Correct answer Explanation This series alternates between two patterns: 7, 8, 9, __ (increases by 1) and 10, 11, 12 (increases by 1). Interleaved: 7, 10, 8, 11, 9, 12, __. The next number after 9 should be 10 (7+1+1+1). Option B (10) is correct.