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.

a__b__c a__b__c__a__c c
A. ababac
B. ababca
C. acacab
D. acbcab

Answer: Option C

Explanation:

Pattern of the series as shown below

aabcc/aabcc/aabcc => acacab

Hence, the missing letters are acacab.