Looking at the series: C2X, G3T, K5P, O7L, ?, W13D
Each term has three components: a letter, a number, and another letter. Let's analyze each component separately.
First letter pattern: C, G, K, O, ?, W
Converting to positions in the alphabet:
- C = 3
- G = 7
- K = 11
- O = 15
- ? = 19
- W = 23
The difference between consecutive terms is 4.
Position 19 corresponds to the letter S.
Number pattern: 2, 3, 5, 7, ?, 13
These are prime numbers in sequence: 2, 3, 5, 7, 11, 13
The missing number is 11.
Last letter pattern: X, T, P, L, ?, D
Converting to positions in the alphabet:
- X = 24
- T = 20
- P = 16
- L = 12
- ? = 8
- D = 4
The difference between consecutive terms is -4.
Position 8 corresponds to the letter H.
The missing term is S11H.
Therefore, the answer is Option 2: S11H.