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.

CDEF__EDC__DE__FED__
A. FCFC
B. FCCD
C. DCCC
D. DEFC

Answer: Option A

Explanation:

Pattern of the series as shown below

CDEF/FEDC/CDEF/FEDC => FCFC

Hence, the missing letters are FCFC.