FTJ, LON, RJR, XEV, _____

To solve this type of question, we need to identify the pattern in the sequence of letters. Each position (first, second, third letter) in the terms follows its own specific rule or pattern. By identifying these patterns, we can find the missing term.

Let us analyze the sequence step by step:

1. First letters: The first letters of the terms are F, L, R, and X. 
   Notice that these letters are separated by a difference of 6 in the alphabetical order:

   • F → L (6 letters forward)
   • L → R (6 letters forward)
   • R → X (6 letters forward)

   Therefore, the next letter will be 6 letters forward from X, which is D.

2. Second letters: The second letters of the terms are T, O, J, and E. 
   Notice that these letters are separated by a difference of -5 in the alphabetical order:

   • T → O (5 letters backward)
   • O → J (5 letters backward)
   • J → E (5 letters backward)

   Therefore, the next letter will be 5 letters backward from E, which is Z.

3. Third letters: The third letters of the terms are J, N, R, and V. 
   Notice that these letters are separated by a difference of +4 in the alphabetical order:

   • J → N (4 letters forward)
   • N → R (4 letters forward)
   • R → V (4 letters forward)

   Therefore, the next letter will be 4 letters forward from V, which is Z.

Combining the results for all three positions, the next term in the sequence is: 
DZZ