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Difficulty: MediumAnalogy and Classification

In the following question, three of the four letter-clusters follow a specific logical pattern based on their alphabetical positions and thus form a group. Which of the following letter-clusters does NOT belong to that group?

  1. A
    F J H M
  2. B
    P T R W
  3. C
    K O M R
  4. C G E IAnswer

Answer

The correct answer is the letter-cluster C G E I, because its final alphabetical shift deviates from the established pattern of the other clusters.
The letter-cluster C G E I is the odd one out. While the other three clusters follow a strict alphabetical position shift of +4, -2, and +5, this cluster follows a shift of +4, -2, and +4 (since E is the 5th letter and I is the 9th, the final shift is only +4).

Step-by-Step Solution

1
Analyze the positional relationship between the letters in the first cluster (F J H M).
The alphabetical shifts are: F(6) to J(10) is +4; J(10) to H(8) is -2; H(8) to M(13) is +5.
To identify the underlying logical rule governing the clusters in the group.
2
Test the remaining clusters against this +4, -2, +5 pattern.
P T R W (16, 20, 18, 23) and K O M R (11, 15, 13, 18) both follow the +4, -2, +5 rule exactly.
To verify that this is indeed the shared pattern forming the group.
3
Evaluate the final cluster (C G E I).
C(3) to G(7) is +4; G(7) to E(5) is -2; but E(5) to I(9) is +4.
To confirm which specific cluster deviates from the established logical group.

Key Concept

Letter-Cluster Classification and Positional Shift Sequencing
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Topics

Analogy and Classification

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