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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 is the one that DOES NOT belong to that group?
EC – HF
MK – PN
IG – LJ
TR – XV
TR – XV
Calculate the difference between letter positions. In most pairs, the difference between letters in each cluster follows a consistent pattern (e.g., -2 or +2), while the outlier deviates.
Calculate the difference between letter positions. In most pairs, the difference between letters in each cluster follows a consistent pattern (e.g., -2 or +2), while the outlier deviates.
Analyze Cluster A, B, and C
In pairs (EC, HF), (MK, PN), and (IG, LJ), the first letter of the second pair is +3 from the first letter of the first pair, and the second letter is +3 from the second letter of the first pair. Example: E(5)+3=H(8), C(3)+3=F(6).
Analyze Cluster D
In the pair (TR, XV): T is 20 and X is 24 (+4 difference). R is 18 and V is 22 (+4 difference). Since the increment is +4 instead of +3, it is the odd one out.
A: Follows the +3 rule for inter-pair letters. B: Follows the +3 rule for inter-pair letters. C: Follows the +3 rule for inter-pair letters.
D is correct because it follows a +4 increment between corresponding letters of the two clusters, whereas A, B, and C follow a +3 increment.
In letter-cluster reasoning, always check the positional difference within the cluster (intra) and between the clusters (inter) immediately.
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