Which letter-cluster will replace the question mark (?) to complete the given series?
PQST, TOVS, ?, BKBQ, FIEP
1
XMYR
2
XYRM
3
YNZQ
4
XNYQ
Which letter-cluster will replace the question mark (?) to complete the given series?
PQST, TOVS, ?, BKBQ, FIEP