Multiple choice general knowledge math & puzzles

1, 4, 6, 9, 11, 14, 16, 19, x

  1. 24

  2. 22

  3. 21

  4. 19
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This sequence has two interleaved patterns. Odd positions (1st, 3rd, 5th, 7th, 9th): 1, 6, 11, 16, 21 (add 5 each time). Even positions (2nd, 4th, 6th, 8th): 4, 9, 14, 19 (add 5 each time). The 9th position is odd, so continues the odd pattern: 16+5=21.

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