Which letter-cluster will replace the question mark (?) to complete the given series?
ETAX, FRDT, GPGP, ?, ILMH
1
HNJL
2
HMJI
3
HNKM
4
HMNI
Which letter-cluster will replace the question mark (?) to complete the given series?
ETAX, FRDT, GPGP, ?, ILMH