Which letter cluster will replace the question mark (?) to complete the given series?
ETRE, AZJG, WFBI, SLTK, ?
1
OPLM
2
ORLM
3
ORMM
4
OPMM
Which letter cluster will replace the question mark (?) to complete the given series?
ETRE, AZJG, WFBI, SLTK, ?