Complete the following series –
_ _ aba _ _ ba _ ab

Which one set of letter when sequentially placed at the gaps in the given letter series shall complete it?
ab __ deabcdfb __ d __ gbcfg __ cf __ h __

How many such pairs of letters are there in the word ‘ANIMATION’ each of which has as many letters between them in the word as in the English alphabet?

Direction: Study the following arrangement carefully and answer the questions given below.
C 3 # R A T 1 E J $ K @ F U 5 4 V I 6 © D 8 * H N 7 δ 2 W

Which of the following is seventh to the left of the twentieth from the left end of the above arrangement? 

What comes in place of question mark (?) in the series given below?
W-144, ?, S-100, Q-81, O-64

What will come in place of question mark(?) in the following number series?

BDE, CFG, EJK,  ?

Select the term that will come next in the following series?
CAY, FDB, IGE, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
 LOG, FLH, ZII, TFJ, NCK,?