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      Question

      Find the wrong number in the following series.

      638, 518, 451, 352, 297, 218
      A 297 Correct Answer Incorrect Answer
      B 218 Correct Answer Incorrect Answer
      C 451 Correct Answer Incorrect Answer
      D 638 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, 25² + 12 = 637 23² − 11 = 518 21² + 10 = 451 19² − 9 = 352 17² + 8 = 297 15² − 7 = 218 Therefore, 637 will come in place of 638

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