Select the letter-cluster that can replace the question mark (?) in the following series.
FIY, HLD, JOI, LRN, NUS, ?
Answer & explanation
Correct answer: option 1

Explanation:
FIY, HLD, JOI, LRN, NUS, ?
The logic followed here is :
F → (+2) → H → (+2) → J → (+2) → L → (+2) → N → (+2) → P
I → (+3) → L → (+3) → O → (+3) → R → (+3) → U → (+3) → X
Y → (+5) → D → (+5) → I → (+5) → N → (+5) → S → (+5) → X
So, the letter-cluster that replaces the (?) to complete the series is "PXX"