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      Question

      A number is divisible by 3 only

      when:
      A the difference of the sum of the odd and the even digits is divisible by 3 Correct Answer Incorrect Answer
      B the sum of its digits is divisible by 3 Correct Answer Incorrect Answer
      C the last digit is either 0 or an even number Correct Answer Incorrect Answer
      D the last two digits are divisible by 3 Correct Answer Incorrect Answer

      Solution

      The correct answer is B

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