Quizlet gmat

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  1. How do you know if a number is divisible by 3?: sum of digits divisible by 3
  2. how do you know if a number is divisbile by 9: sum of digits are divisible by 9
  3. how do you know if a number is divisble by four: last two digits are div by 4
  4. how do you know if a number is divisible by six: even and divisble by three
  5. what is the work formula: (x*y)/(x+y)