Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TSF, RPJ, PMN, NJR, ?
Answer & explanation
Correct answer: option 4

Explanation:
TSF, RPJ, PMN, NJR, ?
The logic followed here is :
T → (-2) → R → (-2) → P → (-2) → N → (-2) → L
S → (-3) → P → (-3) → M → (-3) → J → (-3) → G
F → (+4) → J → (+4) → N → (+4) → R → (+4) → V
So, the letter-cluster that replaces the (?) to complete the series is "LGV"