6 and 30
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multiples of 3 ... 21, 24, 27, 30 (between means leave out 30 multiples of 6 ... 24, 30 so the answer is 24
factors of 60 - 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 2, 4, 6, 10, 12, 20, 30 and 60 are all multiples of 2. This is a total of 8 numbers
Multiples of 6.
The factors of 30 that are not prime numbers are 6, 10 and 30.
The multiples of 12 are an infinite list.