Multiple choice general knowledge math & puzzles

Find the next : (1,1,1,2,2,3,4,5,7,9,12,16, ?)

  1. 21

  2. 22

  3. 28

  4. 20
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A Correct answer
Explanation

This is the Padovan sequence where each term is the sum of the terms two and three places before it: P(n) = P(n-2) + P(n-3). For the last term: 9 + 12 = 21. Distractors like 22 or 20 do not follow this mathematical recurrence relation.

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