Select the letter - cluster that can replace the question mark (?) in the following series.
DLLW, GPPB, JTTG, MXXL, ?
1
PBBR
2
OBBR
3
PAAQ
4
PBBQ
Select the letter - cluster that can replace the question mark (?) in the following series.
DLLW, GPPB, JTTG, MXXL, ?