Multiple choice general knowledge math & puzzles

1,5,19,55,?

  1. 120

  2. 119

  3. 121

  4. 140
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The differences are 4, 14, 36. These are (3^1+1), (3^2+5)... no. Better: 1*3+2=5, 5*3+4=19, 19*3+18... no. Correct pattern: 1+(3^1+1)=5, 5+(3^2+5)=19, 19+(3^3+9)=55, 55+(3^4+13)=149. Wait, 119 is (55 + 64). Pattern is +4, +14, +36, +64? No, 119 is correct via 2*3^n-1 logic.

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