Complete the letter series given below :
Z, A, U, F, P_?

Which letter cluster will replace the question mark (?) in the following series?
CGE, HJI, LPN, SUT, ?

Which letter will replace the question mark (?) in the following series?

B, D, G, I, L, ?, Q

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

FIY, HLD, JOI, LRN, NUS, $?$

If the following words are arranged as per their order in the English dictionary, which word will fifth in the sequence?

1. Weekly
2. Weather
3. Weird
4. Weaver
5. Weight
6. Wielded

Select the option that will fill in the blank and complete the given series.

DXB, GSI, JNP, MIW, _____

Three of the following four letter-clusters are alike in a certain way and one is different.

Select the odd one.

Complete the series by replacing the question mark.

AZY, EXW, IVU, ?

 In the word "DOUBLE" two letters are such that number of letters between those two letters is as many as numbers of letters of alphabet. Find those two letters.

(A) B, E

(B) E, U

(C) O, L

(D) D, B