Which of the following letter-clusters will replace the question mark (?) and complete the following letter-cluster series?
MNA, WDB, EVA, KPB, OLA, ?
1
QJA
2
QJB
3
QKA
4
QKB
Which of the following letter-clusters will replace the question mark (?) and complete the following letter-cluster series?
MNA, WDB, EVA, KPB, OLA, ?