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Multiple choice

A sequence is given, with one term missing. Find the missing term. $3, 7, 15, 31, 63, ?$

  1. $117$
  2. $127$
  3. $126$
  4. $125$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is 2n + 1: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63. So the next term is 63×2+1=127. Each term is double the previous term plus one.

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