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      Question

      Four number-pairs have been given, out of which three

      are alike in some manner and one is different. Select the number-pair that is different.
      A 15: 285 Correct Answer Incorrect Answer
      B 21: 273 Correct Answer Incorrect Answer
      C 16: 272 Correct Answer Incorrect Answer
      D 17: 204 Correct Answer Incorrect Answer

      Solution

      In all the pairs of numbers, the second number is prime multiple of first number. 15: 285 β†’ 285 Γ· 15 = 19 21: 273 β†’ 273 Γ· 21 = 13 16: 272 β†’ 272 Γ· 16 = 17 17: 204 β†’ 204 Γ· 17 = 12

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