Question : Directions: Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
AEI, EIO, IOU, ?
Option 1: UAE
Option 2: AEI
Option 3: OUA
Option 4: All
Correct Answer: OUA
Solution :
Given:
AEI, EIO, IOU, ?
Vowels are replaced with immediate next vowels according to the English alphabetical series and the order is –
A, E, I, O, U
AEI → The immediate next vowel of A is E, the Immediate next vowel of E is I, and the immediate next vowel of I is O → EIO
EIO → The immediate next vowel of E is I, the Immediate next vowel of I is O, and the immediate next vowel of O is U → IOU
IOU → The immediate next vowel of I is O, the Immediate next vowel of O is U, and the immediate next vowel of U is A → OUA
So, the required missing term in the series is OUA. Hence, the third option is correct.
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