Select the letter-Cluster that can replace the question mark (?) in the following series.
ACD, EGH, IKL, ?, QST
Answer & explanation
Correct answer: option 2
Explanation:
ACD, EGH, IKL, ?, QST
The logic followed here is :
A → (+4) → E → (+4) → I → (+4) → M → (+4) → Q
C → (+4) → G → (+4) → K → (+4) → O → (+4) → S
D → (+4) → H → (+4) → L → (+4) → P → (+4) → T
So, the letter-cluster that replaces the (?) to complete the series is "MOP"