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Which of the following options can replace the question mark (?) in the series? ABZ 26, BCY 25, CDX 24, DEW 23, ?
EFV 22
EFU 22
EFV 21
EFU 21
EFV 22
Observe the first two letters of each term follow a continuous alphabetical sequence, while the third letter shifts backward by one and the number decreases by 1.
Observe the first two letters of each term follow a continuous alphabetical sequence, while the third letter shifts backward by one and the number decreases by 1.
Analyze the first two letters
The first letter follows the sequence A → B → C → D → E. The second letter follows the sequence B → C → D → E → F. Thus, the first two letters of the fifth term are EF.
Analyze the third letter
The third letter follows a reverse alphabetical sequence: Z (26) → Y (25) → X (24) → W (23). The next letter before W in the alphabet is V.
Analyze the number
The numeric value decreases by 1 in each step: 26 → 25 → 24 → 23. The next number is 22.
B: The third letter U and number 22 are incorrect because the sequence requires V and the decrement is consistent. C: The number 21 is incorrect because the sequence requires 22. D: The third letter U and number 21 are both incorrect based on the established patterns.
A is correct because the sequence follows the pattern: first letter +1, second letter +1, third letter -1, and number -1, resulting in EFV 22.
For multi-part series, always break the problem into independent streams (letters and numbers) and solve each stream separately to avoid confusion.
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