Classification – Letter sequences (final step direction): in three sequences all steps move backward through the alphabet; in one sequence the last step reverses direction forward. Find the odd one out. Options: T P L I, R N J F, S O K L, Y U Q M.

Introduction / Context:
Multi-letter sequences often use constant backward jumps. Anomalies typically flip direction or alter the step size at the end.

Given Data / Assumptions:

• T→P (−4), P→L (−4), L→I (−3) → all backward.
• R→N (−4), N→J (−4), J→F (−4) → all backward.
• Y→U (−4), U→Q (−4), Q→M (−4) → all backward.
• S→O (−4), O→K (−4), K→L (+1) → final step forward.

Concept / Approach:
Check the direction of each step. Three sequences maintain backward movement throughout; one reverses to a forward step at the end.

Step-by-Step Solution:
Compute successive differences for each sequence.Flag the single case with a positive final step.

Verification / Alternative check:
Even if some sequences change the magnitude (−3 vs −4), only one changes the sign from negative to positive at the end.

Why Other Options Are Wrong:
T P L I, R N J F, Y U Q M: Each maintains backward-only movement across all steps.

Common Pitfalls:
Counting inclusively or misreading letter positions near the ends of the alphabet.

Final Answer:
S O K L