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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 letter-cluster pair DOES NOT belong to that group?
BD-EG
KM-NP
PR-SU
TV-XY
TV-XY
Observe the positional gap between consecutive letters; in three options, the skip between cluster pairs follows a fixed increment, while the odd one breaks this sequence.
Observe the positional gap between consecutive letters; in three options, the skip between cluster pairs follows a fixed increment, while the odd one breaks this sequence.
Analyze positional indices
Convert letters to positions (A=1, B=2...): A: B(2), D(4) and E(5), G(7). Gap: 2 тЖТ 4 (+2), 4 тЖТ 5 (+1), 5 тЖТ 7 (+2). Pattern: +2, +1, +2.
Verify remaining options
B: K(11), M(13) and N(14), P(16). Gaps: 11 тЖТ 13 (+2), 13 тЖТ 14 (+1), 14 тЖТ 16 (+2). C: P(16), R(18) and S(19), U(21). Gaps: 16 тЖТ 18 (+2), 18 тЖТ 19 (+1), 19 тЖТ 21 (+2).
Identify the odd one
D: T(20), V(22) and X(24), Y(25). Gaps: 20 тЖТ 22 (+2), 22 тЖТ 24 (+2), 24 тЖТ 25 (+1). This sequence (+2, +2, +1) does not match the (+2, +1, +2) pattern.
A: Follows the +2, +1, +2 pattern, B: Follows the +2, +1, +2 pattern, C: Follows the +2, +1, +2 pattern.
D is correct because it is the only option that does not follow the (+2, +1, +2) positional gap sequence observed in the other three pairs.
For letter analogies, always quickly write the numeric value of letters if the logical jump isn't immediately obvious; this prevents counting errors.