Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the one that is different.
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Correct answer: (B) CY
Explanation
Each of KP, IR and FU is an opposite-letter pair whose positions add up to 27 (11+16, 9+18, 6+21). CY gives 3 + 25 = 28, so it is the odd one.