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Question

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? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster.)

This question was previously asked in
RRB NTPC 2025 Under Graduate CBT 1 Question Paper PDF (20-Jun-2026) (Shift 3)
The correct answer is

QC - PY

In each pair, check how the first letters and the second letters relate.

GY-FV: G(7)→F(6) is −1, and Y(25)→V(22) is −3.

TL-SI: T(20)→S(19) is −1, and L(12)→I(9) is −3.

AI-ZF: A(1)→Z(26, wrapping back) is −1, and I(9)→F(6) is −3.

QC-PY: Q(17)→P(16) is −1, but C(3)→Y(25) is not −3; going backward from C by 3 gives Z(26), not Y(25), so the second-letter shift breaks the pattern.

Hence, QC-PY is the letter-cluster pair that does not belong to the group.

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