Question

natural number are closed under - and under -​

Answer 1

Answer:

The natural numbers are "closed" under addition and multiplication. A set is closed (under an operation) if and only if the operation on any two elements of the set produces another element of the same set. ... The subtraction of two natural numbers does NOT necessarily create another natural number (3 - 10 = -7).

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Answer 2

The natural numbers are "closed" under addition and multiplication. A set is closed (under an operation) if and only if the operation on any two elements of the set produces another element of the same set. If the operation produces even one element outside of the set, the operation is not closed.