Which letter-cluster will replace the question mark (?) to complete the given series?
BDGF, ACFE, ?, YADC, XZCB
1
ZBED
2
YBED
3
ZAFE
4
YAFD
Which letter-cluster will replace the question mark (?) to complete the given series?
BDGF, ACFE, ?, YADC, XZCB