Classification (number pairs – linear rule): In three pairs the second value follows y = 4x + 2; one pair violates this rule. Identify the odd pair.

Introduction / Context:
Classification problems with ordered pairs frequently hide a simple arithmetic mapping between the first and second numbers. Recognizing a linear relation saves time. In this set, most pairs satisfy the function y = 4x + 2. Your task is to identify the pair that does not satisfy this mapping, indicating a deliberate distractor placed to test attention to detail rather than computational complexity.

Given Data / Assumptions:

• Pairs to test: (6, 26), (11, 46), (9, 40), (16, 66).
• Candidate rule: y = 4x + 2.
• Compute for each x and compare to the listed y.

Concept / Approach:
Apply the same function to every first element. If three pairs match exactly and one does not, the non-matching pair is the odd one out. Linear rules are common because they are easy to compute mentally yet still discriminate careful solvers.

Step-by-Step Solution:

Verification / Alternative check:
Check for off-by-two or typographical error possibilities. Even if 40 appears close to 38, classification requires exact adherence; therefore the pair remains the outlier.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming a different pattern (for example, 5x - something). Test the simplest consistent rule first; if it fits three of four perfectly, it is almost certainly the intended mapping.

Final Answer:
9 : 40