Reasoning - Series Completion - Discussion

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Q.

3, 7, 15, 39, 63, 127, 255, 511  .                          
A. 15 B. 39
C. 63 D. 127

Answer: Option B
Explaination:

 


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




Discussion

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