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      Question

      Four number pair have been given, out of which three are

      alike in a certain way and one is different. Select the one that is different. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g., 13 - operation on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
      A 9 - 72 Correct Answer Incorrect Answer
      B 11 - 117 Correct Answer Incorrect Answer
      C 15 - 221 Correct Answer Incorrect Answer
      D 13 - 165 Correct Answer Incorrect Answer

      Solution

      The logic followed here is: Second number = (First number)² - 4. Option 'A': 9 – 77 → 9² - 4 = 81 - 4 = 77 Option 'B': 11 – 117 → 11² - 4 = 121 - 4 = 117 Option 'C': 15 – 221 → 15² - 4 = 225 - 4 = 221 Option 'D': 13 – 165 → 13² - 4 = 169 - 4 = 165

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