Multiple choice general knowledge math & puzzles

5,11,13,23,_______

  1. 25

  2. 30

  3. 24

  4. 21
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a Fibonacci-like sequence: 5+11=13, 11+13=23, so 13+23=36. But 36 isn't an option. Let me reconsider: 5+11-3=13, 11+13-1=23, 13+23-15=21. Not clear. Another pattern: differences are 6,2,10. 6+2+2=10? Then next difference might be 2+10+10=22, so 23-22=1 (not option). Actually: looking at options, 21 = 23 - 2, 25 = 23 + 2, 24 = 23 + 1, 30 = 23 + 7. Pattern could be alternating: +6, +2, +10, -2. 23-2=21.

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