Select the letter-cluster that can replace the question mark in the given letter-cluster series.
AE, KQ, EI, LR, IO, ?, OU, NT
Answer & explanation
Correct answer: option 4
The given letter-cluster series alternates between the vowels "AEIOU" and the consonants "KLMNR." The pattern is as follows:
AE
KQ
EI
LR
IO
Following this pattern, the next letter-cluster should be a consonant. Among the provided options:
NR: (vowel)
MR: (vowel)
NS: (vowel)
MS: (consonant)