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The pattern followed here is: (1st term)² + 10 = 2nd term 13 – 179 → (13)² + 10 = 169 + 10 = 179 25 – 635 → (25)² + 10 = 625 + 10 = 635 19 – 371 → (19)² + 10 = 361 + 10 = 371 27 – 749 → (27)² + 10 = 729 + 10 = 739 ≠ 749 Hence, '27 : 749' is the odd pair. Option (D) is the correct answer.
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