Which of the following letter-clusters will replace the question mark (?) in the given series ?
DAJ, GEL, JIN, MMP, ?
Answer & explanation
Correct answer: option 4

Explanation:
DAJ, GEL, JIN, MMP, ?
The logic followed here is :
D → (+3) → G → (+3) → J → (+3) → M → (+3) → P
A → (+4) → E → (+4) → I → (+4) → M → (+4) → Q
J → (+2) → L → (+2) → N → (+2) → P → (+2) → R
So, the letter-cluster that replaces the (?) to complete the series is "PQR"