Step 1: Analyze the first letters of each term.
A, B, C, ? \ — \text{Clearly an alphabetical pattern.}
A \rightarrow B \rightarrow C \rightarrow D \Rightarrow \text{Next letter is D.}
Step 2: Analyze the second letters of each term.
T, J, K, ?
Convert to positions in the alphabet:
T (20), J (10), K (11)
Here, the pattern seems unclear, but observe:
- T → J = -10
- J → K = +1
Let’s test the most consistent pattern that fits the sequence:
If we take:
T (20)
J (10) = -10
K (11) = +1
Then logically continuing:
11 + 1 = 12 ⇒ L
So second letter should be L.
Hence, the missing term is: DL