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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.)
QV-SX
KP-MR
AD-CG
BG-DI
AD-CG
Check the alphabetical forward or backward difference between the first and second letters in each pair.
Check the alphabetical forward or backward difference between the first and second letters in each pair.
Analyze Option A (QV - SX)
Q = 17, V = 22 (+5 difference). S = 19, X = 24 (+5 difference). Both parts follow a +5 shift.
Analyze Option B (KP - MR)
K = 11, P = 16 (+5 difference). M = 13, R = 18 (+5 difference). Both parts follow a +5 shift.
Analyze Option C (AD - CG)
A = 1, D = 4 (+3 difference). C = 3, G = 7 (+4 difference). The differences are +3 and +4, which is inconsistent.
Analyze Option D (BG - DI)
B = 2, G = 7 (+5 difference). D = 4, I = 9 (+5 difference). Both parts follow a +5 shift.
A: QV - SX has a consistent +5 shift in both letter pairs. B: KP - MR has a consistent +5 shift in both letter pairs. D: BG - DI has a consistent +5 shift in both letter pairs.
C is correct because AD - CG has a different positional difference (+3 and +4) compared to all other options which maintain a uniform +5 difference.
Always check both the forward and backward alphabetical differences between consecutive letters in letter-cluster series before looking at vowel/consonant properties.
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