Multiple choice general knowledge math & puzzles

7, 15,33,_,149,307

  1. 71

  2. 67

  3. 69

  4. 73
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A Correct answer
Explanation

The pattern follows: multiply by 2 and add consecutive odd numbers. 7 × 2 + 1 = 15, 15 × 2 + 3 = 33, 33 × 2 + 5 = 71, 71 × 2 + 7 = 149, 149 × 2 + 9 = 307. Each step doubles the previous number and adds the next odd number.

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