Select the letter-clusters that can replace the question mark (?) in the following series.
FAN, JDP, NGR, ?, VMV
Answer & explanation
Correct answer: option 3

Explanation:
FAN, JDP, NGR, ?, VMV
The logic followed here is :
F → (-2) → J → (-2) → N → (-2) → R → (-2) → V
A → (-2) → D → (-2) → G → (-2) → J → (-2) → M
N → (+2) → P → (+2) → R → (+2) → T → (+2) → V
So, the letter-cluster that replaces the (?) to complete the series is "RJT"