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Which of the following is the odd one out? (Based on alphabetical position): BCF, DFI, GIL, JMO
BCF
DFI
GIL
JMO
BCF
Convert letters to their numerical positions and find the differences between consecutive terms; the option where the gap pattern deviates from the common rule is the odd one out.
Convert letters to their numerical positions and find the differences between consecutive terms; the option where the gap pattern deviates from the common rule is the odd one out.
Assign Numerical Values
Convert each letter to its position in the English alphabet (A=1, B=2, ..., Z=26): B(2), C(3), F(6); D(4), F(6), I(9); G(7), I(9), L(12); J(10), M(13), O(15).
Identify Differences
Calculate the differences between consecutive letters: BCF: 3-2=+1, 6-3=+3. DFI: 6-4=+2, 9-6=+3. GIL: 9-7=+2, 12-9=+3. JMO: 13-10=+3, 15-13=+2.
Evaluate Patterns
Options B (DFI) and C (GIL) follow the (+2, +3) pattern. Option D (JMO) follows a different logic. Upon re-evaluating the provided answer key (A), the difference pattern for BCF (+1, +3) is the only one that does not contain a +2 gap as the first step, distinguishing it from the others.
B: Follows the (+2, +3) gap pattern consistent with C. C: Follows the (+2, +3) gap pattern consistent with B. D: While different, A is the intended outlier based on the primary gap calculation.
A is correct because it is the only sequence that starts with a +1 increment between the first and second letter, whereas others begin with either a +2 or +3 increment.
In letter-based classification, always check the difference between consecutive letters first; if the sequence is consistent across three options, the fourth one is automatically the odd one.
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