Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
- 
					 a—ba—bb—ab—a
- 
                        - aabb
- baaa
- abab
- baab
 
Correct Option: D
As per given question, the letter series is following the below pattern.
a b ba
After using the pattern the complete letter series will be as below.
a b ba/ a bb a /ab b a
 
	