Multiple choice general knowledge math & puzzles

9,20,43,91,189,??

  1. 389

  2. 395

  3. 391

  4. 387
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is (n * 2) + 2, (n * 2) + 3, (n * 2) + 5, (n * 2) + 7 (adding consecutive prime numbers). 9*2+2=20; 20*2+3=43; 43*2+5=91; 91*2+7=189. The next prime is 11: 189*2+11 = 378+11 = 389.

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