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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? CGM, EIO, GKQ, IMS,?
KOX
KNY
KOV
KOU
KOU
Look at each position independently: 1st letters advance by +2, 2nd letters by +2, and 3rd letters by +2.
Look at each position independently: 1st letters advance by +2, 2nd letters by +2, and 3rd letters by +2.
Analyze 1st Letters
C (3) to E (5) is +2, E to G (7) is +2, G to I (9) is +2, I to K (11). The next 1st letter is K.
Analyze 2nd Letters
G (7) to I (9) is +2, I to K (11) is +2, K to M (13) is +2, M to O (15). The next 2nd letter is O.
Analyze 3rd Letters
M (13) to O (15) is +2, O to Q (17) is +2, Q to S (19) is +2, S to U (21). The next 3rd letter is U.
Combine Letters
Combining the consecutive letters gives KOU.
A: KOX is incorrect because the third letter increases by +2 from S (19), giving U, not X. B: KNY is incorrect because the second and third letters do not match the +2 step pattern. C: KOV is incorrect because the third letter should be U, not V. D: KOU correctly follows the +2 alphabet progression for all three positions.
D is correct because each letter position advances by +2 in the alphabetical sequence, yielding K, O, and U respectively.
In multi-letter series questions, always analyze each character position independently (1st with 1st, 2nd with 2nd, etc.) to quickly spot uniform arithmetic shifts.
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