In the following question, find the missing letters in the given letters.
$$ {D\over 5},{G\over 9},{J\over 14},{M\over20},?$$

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
aba _ baca _ ba _ bacaabac _ aca

Directions: Answer these questions referring to the symbol-letter-number sequence given below:
7 2 A*3 K S Ϩ 5 M W $ 1 ß H ƴ 8 Z @ ∆ J F 9 P # £ X 4 C V 6 ? R

’AK’ is to ‘MH’ and ‘WH’ is to ‘Z#’ in the same way as ‘YJ’ is to……….

Directions: Answer these questions referring to the symbol-letter-number sequence given below:
7 2 A*3 K S Ϩ 5 M W $ 1 ß H ƴ 8 Z @ ∆ J F 9 P # £ X 4 C V 6 ? R

Four of the following five are similar in respect of their positions in the above sequence and hence form a group. Which one does not belong to the group?