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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.)
VQ-TX
ID-GK
LG-JM
RM-PT
VQ-TX
Identify the pattern of gap between the two letters in each cluster. Look for the difference between the alphabetical positions of the pair.
Identify the pattern of gap between the two letters in each cluster. Look for the difference between the alphabetical positions of the pair.
Analyze VQ-TX
V=22, Q=17 (Gap: 22-17=5). T=20, X=24 (Gap: 24-20=4).
Analyze ID-GK
I=9, D=4 (Gap: 9-4=5). G=7, K=11 (Gap: 11-7=4).
Analyze LG-JM
L=12, G=7 (Gap: 12-7=5). J=10, M=13 (Gap: 13-10=3). This gap is 3, not 4.
Analyze RM-PT
R=18, M=13 (Gap: 18-13=5). P=16, T=20 (Gap: 20-16=4).
A: VQ-TX follows the 5, 4 pattern; B: ID-GK follows the 5, 4 pattern; D: RM-PT follows the 5, 4 pattern.
C is correct because in LG-JM, the difference between J and M is 3, whereas in all other options, the difference between the second pair of letters is 4.
When comparing clusters of letters, always check the numerical difference between adjacent letters in each sub-pair first.