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Find the missing term in the letter series: AZ, BY, CX, DW, ?
EV
EU
FV
FU
EV
Recognize that these are opposite letter pairs (A-Z, B-Y, C-X, D-W) where the first letter increases forward (+1) and the second letter decreases backward (-1).
Recognize that these are opposite letter pairs (A-Z, B-Y, C-X, D-W) where the first letter increases forward (+1) and the second letter decreases backward (-1).
Analyze First Letters
The first letters progress forward in the alphabet: A (1) to B (2) to C (3) to D (4). Following this +1 pattern, the next letter is E (5).
Analyze Second Letters
The second letters progress backward in the alphabet: Z (26) to Y (25) to X (24) to W (23). Following this -1 pattern, the next letter is V (22).
Form Final Term
Combining the derived first letter E and second letter V gives the missing term EV.
B: EU is incorrect because U does not follow the reverse sequence from W. C: FV is incorrect because F does not follow the forward sequence from D. D: FU is incorrect because neither letter matches the required pattern.
A is correct because the first letters increase by +1 alphabetically (A, B, C, D, E) and the second letters decrease by -1 (Z, Y, X, W, V), making the missing term EV.
For dual-letter series, always analyze the first and second characters separately; they frequently use complementary directional shifts or standard opposite pairs.
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