What will replace "?' in the following alphanumeric series?

C2X, G3T, K5P, 07L, ?, W13D

S11H

The correct answer is Option (2) → S11H

1. The First Letter (C, G, K, O, ?, W)

Let's look at the position of these letters in the alphabet:

• C = 3
• G = 7 (3 + 4)
• K = 11 (7 + 4)
• O = 15 (11 + 4)
• ? = 15 + 4 = 19 $\rightarrow$ S
• W = 23 (19 + 4)

The first letter of the missing term is S.

2. The Middle Number (2, 3, 5, 7, ?, 13)

Looking at the sequence of numbers: 2, 3, 5, 7, ..., 13.

These are consecutive Prime Numbers.

• The prime number following 7 is 11.
• The prime number following 11 is 13 (which matches the final term).

The middle number of the missing term is 11.

3. The Last Letter (X, T, P, L, ?, D)

Let's look at the position of these letters in the alphabet (moving backward):

• X = 24
• T = 20 (24 – 4)
• P = 16 (20 – 4)
• L = 12 (16 – 4)
• ? = 12 – 4 = 8 $\rightarrow$ H
• D = 4 (8 – 4)

The last letter of the missing term is H.

Summary of the Missing Term

• First Letter: S
• Middle Number: 11
• Last Letter: H

Final Answer: The missing term is S11H.