Multiple choice general knowledge math & puzzles

What is the next number 21, 33, 45, 57, ???

  1. 69

  2. 79

  3. 68

  4. 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.