What should come in place of the question mark (?) to complete the following letter cluster series?
FHG, IKJ, LNM, ?
Answer & explanation
Correct answer: option 3

Explanation:
FHG, IKJ, LNM, ?
The logic followed here is :
F → (+3) → I → (+3) → L → (+3) → O
H → (+3) → K → (+3) → N → (+3) → Q
G → (+3) → J → (+3) → M → (+3) → P
So, the letter-cluster that replaces the (?) to complete the series is "OQP"