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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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"To err is human; to forgive, divine."
- Alexander Pope
Directions to Solve

Find out the wrong number in the series.

13. 

10, 26, 74, 218, 654, 1946, 5834

[A]. 26[B]. 74
[C]. 218[D]. 654
[E]. 1946

Answer: Option A

Explanation:

2nd term = (1st term) x 3 - 4 = 10 x 3 - 4 = 26.

3rd term = (2nd term) x 3 - 4 = 26 x 3 - 4 = 74.

4th term = (3th term) x 3 - 4 = 74 x 3 - 4 = 218.

5th term = (4th term) x 3 - 4 = 218 x 3 - 4 = 650.

5th term must be 650 instead of 654.
Subhash Kumar said: (Mon, Feb 28, 2011 11:35:12 PM)    
 
Why will we chose the 3-4, because of that we can chose other no or not tell me.
Ria Sen said: (Mon, Nov 21, 2011 01:24:14 PM)    
 
I also want to know why we can use only 3 and 4 why not other digits and what is the funda behind it.
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