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      Question

      If the odd digits are decreased by 1 in the number

      63473493, then how many prime numbers remain after rearrangement?
      A Two Correct Answer Incorrect Answer
      B One Correct Answer Incorrect Answer
      C Three Correct Answer Incorrect Answer
      D Four Correct Answer Incorrect Answer
      E Five Correct Answer Incorrect Answer

      Solution

      6 3 4 7 3 4 9 3

      6 2  4 6 2 4 8 2

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