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The logic followed here is: (First number – 2)² = Second number 15 : 144 = (15 – 2)² = 13² = 169 ≠ 144 21 : 361 = (21 – 2)² = 19² = 361 18 : 256 = (18 – 2)² = 16² = 256 29 : 729 = (29 – 2)² = 27² = 729 Thus, the odd pair is 15 : 144. Hence, the correct answer is (A).
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