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They are multiples of 60.
Two and three are relatively prime, or coprime. That means that they have no smaller number, or factor, in common. So, the multiples of both numbers are the multiples of the product of the two, or the multiples of six.
Two common multiples of 21 and 15 are 105 and 315.
All multiples of 64 are multiples of 8.
This cannot be determined because the common multiples of any two or more numbers are infinite.