Find the odd 4-letter block (−3, −1, +3 signature): Pick the option that does not follow the pattern “−3, −1, +3”.
Verbal Reasoning
Classification
Difficulty: Medium
Choose an option
-
ARNMQ
-
BGDCF
-
CLIHK
-
DTQPS
Answer
Correct Answer: RNMQ
Explanation
Introduction / Context:Four-letter sequences can encode a three-step signature in terms of alphabet index differences. When most items share a fixed signature, the single deviation is the odd one out.
Given Data / Assumptions:
- GDCF: G→D (−3), D→C (−1), C→F (+3) → fits.
- LIHK: L→I (−3), I→H (−1), H→K (+3) → fits.
- TQPS: T→Q (−3), Q→P (−1), P→S (+3) → fits.
- RNMQ: R→N (−4), N→M (−1), M→Q (+4) → does not fit (−4, −1, +4).
Concept / Approach:Convert letters to indices and compute successive differences. The outlier will violate the consistent “−3, −1, +3” pattern used by the others.
Step-by-Step Solution:
1) Compute the three differences for each option.2) Compare with the template (−3, −1, +3).3) Only RNMQ yields (−4, −1, +4), so it is odd.Verification / Alternative check:Reverse-direction checks preserve the mismatch, confirming RNMQ as the deviation.
Why Other Options Are Wrong:They conform exactly to the intended signature.
Common Pitfalls:Do not mix up sign and magnitude; both must match the signature.
Final Answer:RNMQ