RRB NTPC 17 January 2017 Paper

(2) PBA, QCB, RDC, SED,__
Every alphabet is increasing one place more than the previous one.
.P ─ Q ─ R ─ S ─ T
B ─ C ─ D ─ E ─ F
A ─ B ─ C ─ D ─ E
⇒ TFE is the next set of alphabets.