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      Question

      Three of the following four number-clusters are alike in

      a certain way and thus form a group. Which is the one that does not belong to that group?
      A 123 Correct Answer Incorrect Answer
      B 259 Correct Answer Incorrect Answer
      C 238 Correct Answer Incorrect Answer
      D 178 Correct Answer Incorrect Answer

      Solution

      123 β†’ 1Β² + 2 = 1 + 2 = 3 259 β†’ 2Β² + 5 = 4 + 5 = 9 238 β†’ 2Β² + 3 = 4 + 3 = 7 β‰  8 178 β†’1Β² + 7 = 1 + 7 = 8 Β  Thus, the odd one out is 238. Hence, the correct answer is (C).

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