They are infinite, starting with: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 . . .
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The multiples of 4 go on for even so there is no mean for the set of multiples of 4.
Any multiple of 12.
It's not. 4 is a multiple of 2. 2 is a factor of 4 because it can divide into 4 evenly with no remainder.
Four has an infinite number of multiples.
Since 4 is a multiple of 2, all the multiples of 4 will be common.
If ordered by size, only every other multiple of 2 is a multiple of 4. All multiples of 4 are multiples of 2.