Which letter-cluster will replace the question mark (?) to complete the given series?
QESC, ?, QOSM, QTSR, QYSW
1
RLSJ
2
QJSH
3
QIRG
4
RKSI
Which letter-cluster will replace the question mark (?) to complete the given series?
QESC, ?, QOSM, QTSR, QYSW