Which letter-cluster will replace the question mark (?) to complete the given series?
PORK, NQPM, LSNO, JULQ, ?
Answer & explanation
Correct answer: option 3

Explanation:
PORK, NQPM, LSNO, JULQ, ?
The logic followed here is :
P → (-2) → N → (-2) → L → (-2) → J → (-2) → H
O → (+2) → Q → (+2) → S → (+2) → U → (+2) → W
R → (-2) → P → (-2) → N → (-2) → L → (-2) → J
K → (+2) → M → (+2) → O → (+2) → Q → (+2) → S
So, the letter-cluster that replaces the (?) to complete the series is "HWJS"