Which letter-cluster will replace the question mark (?) to complete the given series?
KLHO, LKIN, ?, QFNI, UBRE
1
NJKM
2
NIKL
3
OIKM
4
OJKL
Which letter-cluster will replace the question mark (?) to complete the given series?
KLHO, LKIN, ?, QFNI, UBRE