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Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which pair does not belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)
AT-EX
SL-WP
KD-OF
NG-RK
KD-OF
Calculate the alphabetical forward/backward difference between the first and second letter of each cluster pair, and check for a consistent pattern across pairs.
Calculate the alphabetical forward/backward difference between the first and second letter of each cluster pair, and check for a consistent pattern across pairs.
Analyze AT - EX
A (1) to T (20) is +19; E (5) to X (24) is +19. Both parts follow a consistent +19 shift.
Analyze SL - WP
S (19) to L (12) is -7; W (23) to P (16) is -7. Both parts follow a consistent -7 shift.
Analyze KD - OF
K (11) to D (4) is -7. However, O (15) to F (6) is -9. The shifts are inconsistent (-7 and -9).
Analyze NG - RK
N (14) to G (7) is -7; R (18) to K (11) is -7. Both parts follow a consistent -7 shift.
A: AT - EX follows a consistent +19 shift rule. B: SL - WP follows a consistent -7 shift rule. D: NG - RK follows a consistent -7 shift rule.
C is correct because KD - OF does not follow the uniform internal letter shift pattern found in the other three pairs.
Always verify the positional difference for both parts of a letter pair independently to check for uniform arithmetic rules.
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