Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
P_ _ N _ _ S R _ Q P_ R _ _ _ S _ N Q
Answer & explanation
Correct answer: option 4
P S R N Q / P S R N Q / P S R N Q / P S R N Q
S, R, Q, P, N, S, N, Q, P, R