Find the odd letter triple (shared +3 then −2 signature): Select the option that does not match the “+3, −2” two-step pattern.

Introduction / Context:
Two-step signatures are common in short triples. If most items jump forward by 3 and then back by 2, the remaining item will be the one with different magnitudes.

Given Data / Assumptions:

• HKI: H→K (+3), K→I (−2) → fits.
• UXV: U→X (+3), X→V (−2) → fits.
• CFD: C→F (+3), F→D (−2) → fits.
• MQN: M→Q (+4), Q→N (−3) → does not fit.

Concept / Approach:
Compute differences and compare to the template (+3, −2). The sole deviation flags the odd item.

Step-by-Step Solution:

Verification / Alternative check:
Reversing the direction keeps MQN misaligned, confirming it as the odd one.

Why Other Options Are Wrong:
They satisfy the exact two-step signature.

Common Pitfalls:
Do not overlook sign; both magnitude and sign matter.

Final Answer:
MQN