Multiple choice general knowledge math & puzzles 1 4 7 ? 13 11 12 10 8 Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is a simple arithmetic progression with a common difference of 3. Each term increases by 3: 1+3=4, 4+3=7, 7+3=10, and 10+3=13. The missing number is 10, maintaining the constant increment pattern.