This question was previously asked in

Official Soldier GD Paper: [Aro. Jodhpur] - 2021

- 61
- 62
- 63
- 64

Option 3 : 63

The given number series: 3, 7, 15, 31, ___ , 127

The pattern followed here is:

Hence,** "63" **is the missing term in the series.

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