Which letter-cluster will replace the question mark (?) to complete the given series?
AYIN, BWLM, DUOL, ?, KQUJ
1
GSRK
2
GTRL
3
HSQM
4
HTSL
Which letter-cluster will replace the question mark (?) to complete the given series?
AYIN, BWLM, DUOL, ?, KQUJ