In following questions, three sequence of alphabets/numerals are provided which correspond to each other in some way. Find out alphabets/numerals that come in the blank places.Choose the correct option - _ A C _ B D _ C D C D 2 _ 4 1 _ 1 4 _ _ _ _ c d _ b c _ a ? ? ? ?

Answer: A. a, b ,a ,b

Clearly, 4 corresponds to C and a corresponds to 4.
So, a corresponds to C.
1 corresponds to D and b corresponds to 1.
So, b corresponds to D.
Thus, CDCD corresponds to a, b, a, b.