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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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"Nothing is impossible to a willing heart."
- (Proverb)
Directions to Solve

Find out the wrong number in the series.

12. 

15, 16, 34, 105, 424, 2124, 12576

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

Answer: Option D

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.
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