Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
- 
					 QST __, QS __ R, Q __ TR, __STR
- 
                        - SQTR
- RTSQ
- TRQS
- TSRQ
 
Correct Option: B
As per given question, the letter series is following the below pattern.
Q S T R
After using the pattern the complete letter series will be as below.
Q S T R / Q S T R/ Q S TR/ Q STR
 
	