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What should come in place of the question mark (?) in the given series based on the English alphabetical order?
MOP FHI YAB RTU ?
KMU
KMJ
KNM
KMN
KMN
Quick Trick: Analyze the position of the 1st letter of each 3-letter cluster: M (13) -> F (6) -> Y (25) -> R (18). Each step subtracts 7 from the alphabetical position (13 - 7 = 6; 6 - 7 = -1 ≡ 25; 25 - 7 = 18; 18 - 7 = 11 -> K). Only Option D sta...
Analyze the position of the 1st letter of each 3-letter cluster: M (13) -> F (6) -> Y (25) -> R (18). Each step subtracts 7 from the alphabetical position (13 - 7 = 6; 6 - 7 = -1 ≡ 25; 25 - 7 = 18; 18 - 7 = 11 -> K). Only Option D starts with K and ends with N.
Analyze 1st Letter Position Pattern
Look at the first letter of each cluster: M (13), F (6), Y (25), R (18). Transition: 13 - 7 = 6 (F); 6 - 7 = -1 ≡ 25 (Y); 25 - 7 = 18 (R). Following the same rule: 18 - 7 = 11, which corresponds to 'K'.
Analyze 2nd Letter Position Pattern
Look at the second letter of each cluster: O (15), H (8), A (1), T (20). Transition: 15 - 7 = 8 (H); 8 - 7 = 1 (A); 1 - 7 = -6 ≡ 20 (T). Following the same rule: 20 - 7 = 13, which corresponds to 'M'.
Analyze 3rd Letter Position Pattern
Look at the third letter of each cluster: P (16), I (9), B (2), U (21). Transition: 16 - 7 = 9 (I); 9 - 7 = 2 (B); 2 - 7 = -5 ≡ 21 (U). Following the same rule: 21 - 7 = 14, which corresponds to 'N'.
A: KMU is incorrect because the third letter must be N (21 - 7 = 14), not U. B: KMJ is incorrect because the third letter is N (14th position), not J (10th position). C: KNM is incorrect because the second letter must be M (13) and third letter must be N (14), reversing them gives KNM.
D is correct because applying a consistent -7 subtraction shift across all letter positions yields K (18 - 7 = 11), M (20 - 7 = 13), and N (21 - 7 = 14) to form KMN.
When subtraction results in a non-positive integer (e.g., 6 - 7 = -1 or 1 - 7 = -6), add 26 to find the correct backward cyclic alphabet position (e.g., -1 + 26 = 25 -> Y; -6 + 26 = 20 -> T).