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Divisibility by 3

  1. Which of the following integers are divisible by 3?

    2854267

    34753851

    548733521

    148322838

    123456789
     

  2. If the integer, 1849a, is divisible by 3, find all possible values of a.
     
  3. If the integer, 4278a6, is divisible by 3, find all possible values of a.
     
  4. If the integer, 529ab3, is divisible by 3, find all possible values of a and b.
     
  5. An integer with three digits is divisible by three. If the tens digit is twice the ones digit and the hundreds digit is two greater than the ones digit, find the integer.