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      Question

      12 23 65 ? 1239

      7409
      A 215 Correct Answer Incorrect Answer
      B 249 Correct Answer Incorrect Answer
      C 251 Correct Answer Incorrect Answer
      D 151 Correct Answer Incorrect Answer
      E 185 Correct Answer Incorrect Answer

      Solution

      12 × 2 - 1² = 23 23 × 3 - 2² = 65 65 × 4 - 3² = 251 251 × 5 - 4² = 1239 1239 × 6 - 5² = 7409

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