Multiple choice general knowledge math & puzzles 2 3 4 9............... 81 14 16 32 36 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The sequence follows two patterns: 2, 4, 16 (each is the square of the previous) and 3, 9, 81 (each is the square of the previous). The missing number is 4 squared, which is 16.