One term in the number series is wrong. Find out the wrong term.
3, 7, 15, 39, 63, 127, 255, 511
  • 115
  • 239
  • 363
  • 4127
Answer:- 1
Explanation:-

Solution:
The correct pattern is x 2 + 1.
So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.

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