Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
PGF, QJK, RMP, SPU, ?
1
RTZ
2
USX
3
TSZ
4
STY
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
PGF, QJK, RMP, SPU, ?