In the following question, select the odd letter pair from the alternatives given below. Three options contain consecutive letters in alphabetical order, while one option does not. Identify the odd pair. (A) CD (B) PR (C) ST (D) WX (E) HI

Introduction / Context:
This odd-one-out question tests recognition of consecutive letter pairs. A consecutive pair means the second letter comes immediately after the first letter in the alphabet (for example, C followed by D). The odd pair is the one where the letters are not consecutive.

Given Data / Assumptions:

• Alphabet order: A, B, C, ..., Z.
• A consecutive pair has a gap of exactly +1 (second letter is next letter).
• We verify each pair by checking if the second letter is immediately next.

Concept / Approach:
Check the alphabetical distance in each pair. If the distance is 1 for most options and one pair has a distance greater than 1, that pair is the odd one out.

Step-by-Step Solution:

Verification / Alternative check:
Using alphabet positions: P=16 and R=18, the gap is 18 - 16 = 2, not 1. All the other pairs have a gap of 1. This confirms PR is the only non-consecutive pair and hence the odd one out.

Why Other Options Are Wrong:

Common Pitfalls:
Some students visually assume PR looks 'nearby' and treat it as consecutive without checking the missing Q. Another pitfall is confusing consecutive with 'both consonants' or 'both near the end'. Always verify using the immediate-next-letter rule or position difference of 1.

Final Answer:
PR