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Which of the following options should come in place of the question mark (?) in the given series based on the English alphabetical order? DJC, YEX, TZS, OUN,?
JPM
JRI
JRM
JPI
JPI
Analyze the pattern for each of the three letter positions independently: 1st letters follow -5, 2nd letters follow +4 (looping through A-Z), and 3rd letters follow +5 (looping through A-Z).
Analyze the pattern for each of the three letter positions independently: 1st letters follow -5, 2nd letters follow +4 (looping through A-Z), and 3rd letters follow +5 (looping through A-Z).
Analyze the first letter position
D (4) → Y (25): 4 - 5 = -1, which is 25 (Y). Y (25) → T (20): 25 - 5 = 20. T (20) → O (15): 20 - 5 = 15. O (15) → J (10): 15 - 5 = 10. The first letter is J.
Analyze the second letter position
J (10) → E (5): 10−5 = 5 (E). E (5) → Z (26): 5 - 5 = 0, which is 26 (Z). Z (26) → U (21): 26 - 5 = 21. U (21) → P (16): 21 - 5 = 16. The second letter is P.
Analyze the third letter position
C (3) → X (24): 3 - 5 = -2, which is 24 (X). X (24) → S (19): 24 - 5 = 19. S (19) → N (14): 19 - 5 = 14. N (14) → I (9): 14 - 5 = 9. The third letter is I.
A: The second letter J is incorrect (pattern leads to P). B: The third letter M is incorrect (pattern leads to I). C: The third letter M is incorrect (pattern leads to I).
D is correct because following the -5 alphabetical shift for all positions, the sequence yields J, P, and I respectively.
For letter series, always write the numerical rank of letters (A=1, Z=26) to perform calculations quickly; remember that circular shifting (e.g., A-1 = Z) is a common exam trope.
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