Which letter will replace the question mark (?) in the following series?
FLO ,H?Q, JPS, LRU
Answer & explanation
Correct answer: option 3

Explanation:
FLO ,H?Q, JPS, LRU
The logic followed here is :
F → (+2) → H → (+2) → J → (+2) → L
L → (+2) → N → (+2) → P → (+2) → R
O → (+2) → Q → (+2) → S → (+2) → U
So, the letter-cluster that replaces the (?) to complete the series is "N"