Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
AEI, EIO, IOU, ?
Answer & explanation
Correct answer: option 3
Explanation:
AEI, EIO, IOU, ?
The logic followed here is :
A → (+4) → E → (+4) → I → (+6) → O
E → (+4) → I → (+6) → O → (+6) → U
I → (+6) → O → (+6) → U → (+6) → A
So, the letter-cluster that replaces the (?) to complete the series is "OUA"