1.  In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative : aab _ ab _ cabcca _ bcab _ c

A. bbbc
B. bbab
C. cabc
D. cbab

Answer: Option D

Explanation:

The series is aa / bcab / bcab / ccaa / bcab / bc.

Thus, the pattern ccaa followed by bcab repeated twice, makes up the series.