Side QR of a triangle PQR is produced to a point S and a ray RT is drawn perpendicular to side PR such that TRS is an acute angle. If ∠P ∶ ∠Q ∶ ∠R = 3 ∶ 2 ∶ 1, then the value of ∠TRS is: 

1
30°
2
40°
3
50°
4
60°

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