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Classification (letter sequences): Find the odd four-letter sequence. Three options move back by a constant number of letters each time; one does not follow the same decrement pattern.

Difficulty: Medium

WTQN
MIDA
KHEB
NKHE

Correct Answer: MIDA

Explanation:

Introduction / Context:
This is a classification problem involving 4-letter sequences. The common pattern to look for is a fixed decrement in alphabet positions from one letter to the next within a sequence. We must choose the sequence that fails to maintain that constant step size.

Given Data / Assumptions:

Alphabet indices: A=1 to Z=26.
Options: NKHE, MIDA, KHEB, WTQN.
We check consecutive differences for each sequence.

Concept / Approach:
Compute positional differences for each jump inside a sequence. If all three jumps are equal (e.g., −3, −3, −3), the sequence is consistent. Any deviation marks the odd one out.

Step-by-Step Solution:

NKHE: N(14)→K(11)=−3; K(11)→H(8)=−3; H(8)→E(5)=−3 (consistent).KHEB: K(11)→H(8)=−3; H(8)→E(5)=−3; E(5)→B(2)=−3 (consistent).WTQN: W(23)→T(20)=−3; T(20)→Q(17)=−3; Q(17)→N(14)=−3 (consistent).MIDA: M(13)→I(9)=−4; I(9)→D(4)=−5; D(4)→A(1)=−3 (not consistent).

Verification / Alternative check:
Visualize as numerical arrays and subtract; only MIDA has unequal decrements (−4, −5, −3).

Why Other Options Are Wrong:

NKHE keeps −3 at all steps.KHEB keeps −3 at all steps.WTQN keeps −3 at all steps.

Common Pitfalls:
Confusing direction (adding vs subtracting) or missing the negative sign. Always compute from left to right consistently.

Classification (letter sequences): Find the odd four-letter sequence. Three options move back by a constant number of letters each time; one does not follow the same decrement pattern.

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