Which letter-cluster will replace the question mark (?) in the following series?
GXB, JVD, MTF, PRH, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
NZ, PB, RE, TI, VN, XT, ?, BI

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
N, P, ?, U, X, Z, C, E, H

Find the missing term: AZY, BXW, CVU, DTS, ?, FPO.

What should come in place of the question mark (?) in the given series based on the English alphabetical order?
XZR, UWO, RTL, OQI, ?

What should come in place of the question mark (?) in the given series based on the English alphabetical order?
GBD, IDF, KFH, MHJ, ?

What should come in place of the question mark (?) in the given series based on the English alphabetical order?
DNY, YIT, TDO, OYJ, ?

What should come in place of the question mark (?) in the given series based on the English alphabetical order?
U, ? , I , E, A.