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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? ACY, MOK, YAW, KMI,?
WZU
WYU
WZV
WYV
WYU
Analyze the pattern for each of the three positions (1st, 2nd, 3rd letters) independently: 1st letters move +12, 2nd letters move +12, and 3rd letters move -16 or +10 in the alphabet.
Analyze the pattern for each of the three positions (1st, 2nd, 3rd letters) independently: 1st letters move +12, 2nd letters move +12, and 3rd letters move -16 or +10 in the alphabet.
Analyze the first letter of each term
A (1) + 12 = M (13); M (13) + 12 = Y (25); Y (25) + 12 = K (11, since 25+12=37, 37-26=11); K (11) + 12 = W (23). The first letter is W.
Analyze the second letter of each term
C (3) + 12 = O (15); O (15) + 12 = A (1, since 15+12=27, 27-26=1); A (1) + 12 = M (13); M (13) + 12 = Y (25). The second letter is Y.
Analyze the third letter of each term
Y (25) + 12 = K (11, since 25+12=37, 37-26=11); K (11) + 12 = W (23); W (23) + 12 = I (9, since 23+12=35, 35-26=9); I (9) + 12 = U (21). The third letter is U.
A: WZU is wrong because the second letter must be Y. C: WZV is incorrect in the second and third positions. D: WYV is incorrect because the third letter must be U.
B is correct because applying a consistent shift of +12 to each letter across all three positions (A,C,Y) → (M,O,K) → (Y,A,W) → (K,M,I) leads to (W,Y,U).
For complex letter series, always separate the letters into parallel sub-series; usually, the shift value remains constant throughout the entire series for each position.
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