Multiple choice general knowledge math & puzzles

1.The missing term in the sequence 3,7,15,31,__,127.

  1. 63

  2. 71

  3. 92

  4. 113
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern follows 2^n - 1 where n starts at 2: 2^2-1=3, 2^3-1=7, 2^4-1=15, 2^5-1=31, 2^6-1=63, 2^7-1=127. Alternatively, each term doubles and adds 1: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63.

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