Classification (letters): Identify the odd group among the following three-letter sequences, where each group may or may not follow a consistent positional jump pattern in the English alphabet. Choose the one that does not follow the same rule as the others.

Introduction / Context:
In many verbal reasoning classification questions, the groups of letters follow a consistent positional rule based on the English alphabet. The task is to spot the group that breaks the common rule. Here, each option is a triad (three letters), and we examine the step sizes between consecutive letters.

Given Data / Assumptions:

• Alphabet positions: A=1, B=2, …, Z=26.
• Options: HJN, JLP, PRU, QSW.
• We check the deltas (step sizes) between consecutive letters inside each triad.

Concept / Approach:
The dominant pattern in three of the groups is +2 followed by +4 in letter positions (for example, H→J is +2 and J→N is +4). Any triad that does not show the same pair of jumps is the odd one out.

Step-by-Step Solution:

Verification / Alternative check:
An alternative way is to write each triad as numerical positions and compute differences. Only PRU yields +2 and +3; others yield +2 and +4, confirming the anomaly.

Why Other Options Are Wrong:

Common Pitfalls:
Mixing up alphabet indices or miscounting steps by off-by-one errors is common. Another pitfall is assuming constant increments (+2, +2) instead of checking both steps separately.

Final Answer:
PRU