Which letter-cluster will replace the question mark (?) to complete the given series?

LMR, PUA, TCJ, XKS, ?

Which letter-cluster will replace the question mark (?) to complete the given series?

ABCD, FVJV, KPQN, PJXF, ?

Which letter-cluster will replace the question mark (?) to complete the given series?

QRM, PWD, OBU, NGL, ?

Which letter-cluster will replace the question mark (?) to complete the given series?
 CZNM, FXOL, IVPK, ?, ORRI

Which letter-cluster will replace the question mark (?) to complete the given series?

REV, UXD, XQL, AJT, ?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

ROM, URJ, XUG, AXD, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
 NMQR, NQYD, NUGP, NYOB, ?

Which letter-cluster will replace the question mark (?) to complete the given series?
 TBNF, CJUL, LRBR, UZIX, ?