In the following question , a series is given with one terms missing . Choose the correct alternative from the given ones that will complete the series :

ABC , DEF , HIJ , ? 

Find the missing term (?) in the series.
DABC, HEFG, ?, PMNO, TQRS

Directions : In each of the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it.

ab ---b -bbaa- 

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

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? 

If every fifth letter is removed from the left in the English alphabet, then what will be the 5th letter left of the 14th letter from the left in this new alphabet?
ABCDEFGHIJKLMNOPQRSTUVWXYZ 

In the word INSTRUCT, how many alphabets are there between which there are as many letters as there are between them in the English alphabet? 

If it is possible to make a meaningful word of English together with the first, fifth and eighth letters of the word APTITUDES, how many total words can be made of this type?