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      Question

      When a certain number is multiplied by 7, the product

      entirely comprises ones only (1111…..). What is the smallest such number ?
      A 15713 Correct Answer Incorrect Answer
      B 15723 Correct Answer Incorrect Answer
      C 15783 Correct Answer Incorrect Answer
      D 15873 Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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