Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
MEND, PHJZ, SKFV, VNBR, ?
Answer & explanation
Correct answer: option 2
Explanation:

Explanation:
MEND, PHJZ, SKFV, VNBR, ?
The logic followed here is :
M → (+3) → P → (+3) → S → (+3) → V → (+3) → Y
E → (+3) → H → (+3) → K → (+3) → N → (+3) → Q
N → (-4) → J → (-4) → F → (-4) → B → (-4) → X
D → (-4) → Z → (-4) → V → (-4) → R → (-4) → N
So, the letter-cluster that replaces the (?) to complete the series is "YQXN"