Multiple choice general knowledge math & puzzles

4 9 20 43 90 ___

  1. 105

  2. 198

  3. 175

  4. 185
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: multiply by 2 and add 1. 4×2+1=9, 9×2+2=20, 20×2+3=43, 43×2+4=90. The additive term increases by 1 each time: +1, +2, +3, +4. Next is 90×2+5=185.

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