Select the letter cluster that will replace the question mark (?) in the following series.

RBT, OER, KIP, FNN, ZTL, ?

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

RXBG, OVEK, ?, IRKS, FPNW

Which of the following terms will replace the question mark (?) in the given series?

ABC, ZYX, BCD, YXW, CDE, ?

Select the option that represents the letters that, when placed from left to right in the blanks below, will complete the letter series.

A C _ G I _ C _ G I A _ E G I A C E _ I _ C E _ I

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

LMO, PQS, TUW, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

AF, CH, EJ, GL, ?

A series is given with some letters missing. Choose the correct alternative from the given ones that will complete the series:

A series is given with some letters missing. Choose the set of letters which when sequentially placed shall complete it .

In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below It. Choose the correct alternative

In the series _b_a_ba_b_abab_aab;

fill in the six blanks ( _ ) using one of the following given four choices such that the series follows a specific order.