{3, 4, 5, 6, 7}
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natural numbers
The numbers 1, 2, 3, ... , 18, 19.
No, the natural numbers are not closed under division. For example, 2 and 3 are natural numbers, but 2/3 is not.
No. Natural number {1, 2, 3, ...}.
The set of integers I. I = {..., -3, -2, -1, 0, 1, 2, 3, ...}