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Natural number are closed under subtraction or not?

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eginarrayl	extClosure Property:\ 	extNatural numbers are always closed under addition and multiplication. The addition and multiplication of two or more natural numbers will always yield a natural number.\ 	extIn the case of subtraction and division, natural numbers do not obey closure property, which means subtracting or dividing two natural numbers might not give a natural number as a result.\ 	extSubtraction: 9 - 5 = 4, 3 - 5 = -2, etc. In this case, the result may or may not be a natural number.endarray

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