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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.)
JH-FI
QO-MP
NL-JL
TR-PS
NL-JL
Convert each letter to its alphabetical position (A=1 to Z=26) and check the forward or backward differences between consecutive letters within each pair.
Convert each letter to its alphabetical position (A=1 to Z=26) and check the forward or backward differences between consecutive letters within each pair.
Step 1: Analyze Option A (JH-FI)
J (10) to H (8) is -2. F (6) to I (9) is +3. Pattern is [-2, +3].
Step 2: Analyze Option B (QO-MP)
Q (17) to O (15) is -2. M (13) to P (16) is +3. Pattern is [-2, +3].
Step 3: Analyze Option C (NL-JL)
N (14) to L (12) is -2. J (10) to L (12) is +2. Pattern is [-2, +2], which violates the common rule.
Step 4: Analyze Option D (TR-PS)
T (20) to R (18) is -2. P (16) to S (19) is +3. Pattern is [-2, +3].
A: Follows the standard -2 and +3 letter position difference pattern. B: Follows the standard -2 and +3 letter position difference pattern. D: Follows the standard -2 and +3 letter position difference pattern.
C is correct because NL-JL follows a different difference pattern (-2, +2) compared to all other options which follow (-2, +3).
When analyzing letter clusters, always convert letters to numerical values to quickly spot arithmetic intervals or sequence rules.
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