Multiple choice general knowledge math & puzzles 3, 5, 11, 14, 17, 21 21 17 14 3 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The number 14 is the only even number in the sequence, while all others (3, 5, 11, 17, 21) are odd. This makes 14 the clear outlier based on the fundamental property of divisibility by 2.