1. 

In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four / five alternatives below the series. Find out the correct alternative.

BA__BA__BAC__ACB__CBAC
A. AACB
B. BBCA
C. CCBA
D. CBAC

Answer: Option C

Explanation:

Pattern of the series as shown below

BAC/BAC/BAC/BAC/BAC/BAC => CCBA

Hence, the missing letters are CCBA.