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Aptitude - Odd Man Out and Series - Discussion

@ : Home > Aptitude > Odd Man Out and Series > Find Wrong No. - Discussion

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"When ambition ends, happiness begins."
- (Proverb)
Directions to Solve

Find out the wrong number in the series.

10. 

3, 7, 15, 39, 63, 127, 255, 511

[A]. 7[B]. 15
[C]. 39[D]. 63
[E]. 127

Answer: Option B

Explanation:

Go on multiplying 2 and adding 1 to get the next number.

So, 39 is wrong.
Ashik Mohammed Nazar said: (Tue, Jun 7, 2011 05:32:21 PM)    
 
3,7,15,39,63,127,255,511
If u closely look at this pattern,and the differences between the consecutive numbers,
It is 4 8 24 24 64 128 256
By changing 39 to 31, the differences become
4 8 16 32 64 128 256 which is
2^2 2^3 2^3 2^4 and so on ...
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