Multiple choice general knowledge math & puzzles

Complete the series. 1,5,18,67,?

  1. 211

  2. 197

  3. 269

  4. 159
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The differences between terms are: 5-1=4, 18-5=13, 67-18=49, 197-67=130. These differences (4, 13, 49, 130) follow a pattern where second differences are 3², 6², 9² (i.e., 9, 36, 81). Each second difference is a multiple of 3 squared: 9×1², 9×2², 9×3².

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