Select the letter-cluster that can replace the question mark (?) in the following series.
NAVIGATE, PCVIGATE, NAXKGATE, ? , NAVIGAVG
Answer & explanation
Correct answer: option 3

Explanation:
NAVIGATE, PCVIGATE, NAXKGATE, ? , NAVIGAVG
The logic followed here is :
N → (+2) → P → (-2) → N → (0) → N → (0) → N
A → (+2) → C → (-2) → A → (0) → A → (0) → A
V → (0) → V → (+2) → X → (-2) → V → (0) → V
I → (0) → I → (+2) → K → (-2) → I → (0) → I
G → (0) → G → (0) → G → (+2) → I → (-2) → G
A → (0) → A → (0) → A → (+2) → C → (-2) → A
T → (0) → T → (0) → T → (0) → T → (+2) → V
E → (0) → E → (0) → E → (0) → E → (+2) → G
So, the letter-cluster that replaces the (?) to complete the series is "NAVIICTE"