Multiple choice

(Number series) Find the missing term: 3, 7, 15, 31, ?, 127

  1. 61

  2. 63

  3. 65

  4. 62
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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, 63*2+1=127.

AI explanation

This series follows a pattern where each term is multiplied by 2 and then 1 is added to find the next term. Multiplying 3 by 2 and adding 1 gives 7, multiplying 7 by 2 and adding 1 gives 15, and multiplying 15 by 2 and adding 1 gives 31. Applying this rule to 31, we multiply by 2 and add 1 to arrive at 63.

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