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      Question

      Four number-pairs are given, out of which three are

      alike in a certain manner and one is different. Choose the different number-pair.
      A 345 : 100 Correct Answer Incorrect Answer
      B 284 : 168 Correct Answer Incorrect Answer
      C 562 : 130 Correct Answer Incorrect Answer
      D 693 : 250 Correct Answer Incorrect Answer

      Solution

      The pattern followed here is: The square of each digit of the first number is added together, and the result is multiplied by 2 to obtain the code. 345: 100 β†’ 2 X (3Β² + 4Β² + 5Β²) = 2 X (9 + 16 + 25) = 2 X 50 = 100 284 : 168 β†’ 2 X (2Β² + 8Β² + 4Β²) = 2 X (4 + 64 + 16) = 2 X 84 = 168 562 : 130 β†’ 2 X (5Β² + 6Β² + 2Β²) = 2 X (25 + 36 + 4) = 2 X 65 = 130 693 : 252 β†’ 2 X (6Β² + 9Β² + 3Β²) = 2 X (36 + 81 + 9) = 2 X 126 = 252

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