Aptitude - Odd Man Out and Series - Discussion

Find out the wrong number in the series.

12. 

15, 16, 34, 105, 424, 2124, 12756

[A]. 16
[B]. 34
[C]. 105
[D]. 424
[E]. 2124

Answer: Option E

Explanation:

2nd term = (1st term) x 1 + 1 = 15 x 1 + 1 = 16.

3rd term = (2nd term) x 2 + 2 = 16 x 2 + 2 = 34.

4th term = (3th term) x 3 + 3 = 34 x 3 + 3 = 105.

5th term = (4th term) x 4 + 4 = 105 x 4 + 4 = 424

6th term = (5th term) x 5 + 5 = 424 x 5 + 5 = 2125

6th term should 2125 instead of 2124.


Samir said: (Jan 21, 2015)  
Awesome and easy to solve in this process.

Kartik Joshi said: (Jan 6, 2018)  
Please explain, how 15, the 1st term sits in this series?

Priya said: (Jun 17, 2018)  
2, 80, 619, 3690, 18475, 73916.

How to solve this? Please explain me.

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