Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
- 
					 aa__baa__aaa__ba__ba
- 
                        - abba
- abab
- abaa
- babb
- NA
 
Correct Option: E
The given letter series in below pattern.
a a b b a a b a
After completing the pattern, we will get complete letter series.
a a b b a a b a/ a a b b a a b a
 
	