Which letter-cluster will replace the question mark (?) to complete the given series?
OLJB, ?, IVDL, FAAQ, CFXV
1
LQGG
2
ROFJ
3
SRGK
4
LRFK
Which letter-cluster will replace the question mark (?) to complete the given series?
OLJB, ?, IVDL, FAAQ, CFXV