Alphanumeric series – fill in the missing pair. Sequence: J14, L16, __, P20, R22, …

Introduction / Context:
Alphanumeric series couple letter steps with number steps. The letter component usually follows the alphabet, and the number component follows an arithmetic pattern. Solve them independently and recombine.

Given Data / Assumptions:

• Sequence: J14, L16, __, P20, R22
• Letters: J, L, ?, P, R
• Numbers: 14, 16, ?, 20, 22
• Assume separate, consistent progressions for letters and numbers.

Concept / Approach:

Map letters to alphabetical positions and look for a constant step. Do the same for numbers using differences. The missing pair must satisfy both independent patterns at the same index.

Step-by-Step Solution:

Verification / Alternative check:

Check neighbors: L16 → N18 is +2 in both letter and number; N18 → P20 is also +2 in both. This symmetry confirms the pattern.

Why Other Options Are Wrong:

S24 or T24 leap by +8 or +10 in letters and +8 in numbers—too large. M18 has correct number but wrong letter step (−1). Only N18 preserves the consistent +2/+2 rhythm.

Common Pitfalls:

Linking letter and number changes (they are independent) or miscounting alphabetical positions. Always separate the two tracks.

Final Answer:

N18