Multiple choice general knowledge math & puzzles

5, 11, 22, 43, ---

  1. 83

  2. 82

  3. 84

  4. 85
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is $x imes 2 + 1$, then $x imes 2$, alternating: $5 imes 2 + 1 = 11$; $11 imes 2 = 22$; $22 imes 2 - 1 = 43$. This is inconsistent. A better pattern is $x imes 2 + 1, + 0, - 1, - 2$: $5 imes 2 + 1 = 11$; $11 imes 2 + 0 = 22$; $22 imes 2 - 1 = 43$; $43 imes 2 - 2 = 84$.

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