Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
- 
					 a__b__a__ __n__bb__abbn
- 
                        - abnabb
- bnbban
- bnbbna
- babban
 
Correct Option: B
The pattern of given letter series is :-
a b b n
After completing the pattern, we will get complete letter series.
a b b n/ a bb n/ a bb n/ abbn
 
	