Find the odd 4-letter mixed-case block (+1, −3, +1 signature): Choose the option that does not follow “+1, −3, +1”.

Introduction / Context:
Adding case variety can disguise a simple numeric signature. Treat upper and lower case as the same positions and check a three-step pattern such as “+1, −3, +1”.

Given Data / Assumptions:

• CdaB: C→d (+1), d→a (−3), a→B (+1) → fits.
• VwtU: V→w (+1), w→t (−3), t→U (+1) → fits.
• LmjK: L→m (+1), m→j (−3), j→K (+1) → fits.
• RsqP: R→s (+1), s→q (−2), q→P (−1) → breaks.

Concept / Approach:
Compute successive differences ignoring case. The outlier fails either the sign sequence or the magnitudes.

Step-by-Step Solution:

Verification / Alternative check:
The first three share both the sign pattern and magnitudes; only the fourth diverges twice.

Why Other Options Are Wrong:
They conform to the full signature, not just parts of it.

Common Pitfalls:
Ensure you keep the order and signs; mixing them reverses the logic.

Final Answer:
RsqP