Which letter-cluster will replace the question mark (?) to complete the given series?
ZOFB, ?, VKJF, TILH, RGNJ
1
XNIF
2
BQJF
3
XMHD
4
BNHE
Which letter-cluster will replace the question mark (?) to complete the given series?
ZOFB, ?, VKJF, TILH, RGNJ