Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
- 
					 aa–b–abc–ac–a–de
- 
                        - babcc
- aaada
- abade
- abaad
 
Correct Option: B
As per given question, the letter series is following the below pattern.
a a a b
Using the same pattern, we will get complete letter series.
a a a b/ a a b c/ a a c d/ a a d e 
Therefore,? = a a a d a
 
	