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Which of the following is not a factor of 30?

  1. 5

  2. 6

  3. 11

  4. 15

The correct answer is: 11

30 is divisible by 5, 6, and 15, making them factors of 30. However, 11 is not a factor of 30 as it does not divide evenly into 30. This means that 30 cannot be divided into 11 equal groups without any remainder. Therefore, 11 is not a factor of 30.