Multiple choice general knowledge math & puzzles What is the next number 21, 33, 45, 57, ??? 69 79 68 59 Reveal answer Fill a bubble to check yourself A Correct answer Explanation The sequence follows a pattern of adding 12 to the previous number: 21+12=33, 33+12=45, 45+12=57. Therefore, 57+12=69. The other options do not follow this constant arithmetic progression.