Multiple choice general knowledge math & puzzles

4,9,20,43,90??

  1. 143

  2. 180

  3. 185

  4. none
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is $x \times 2 + 1, x \times 2 + 2, x \times 2 + 3, x \times 2 + 4$. Specifically: $4 \times 2 + 1 = 9$; $9 \times 2 + 2 = 20$; $20 \times 2 + 3 = 43$; $43 \times 2 + 4 = 90$; $90 \times 2 + 5 = 185$.

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