Question

_______ and _______ are not closed under subtraction.​

Answer 1

Answer:

So, in other words, they are natural numbers. And we know that natural numbers are closed under addition and multiplication only. So, positive integers are not closed under subtraction

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Answer 2

Answer:

Whole numbers ,Irrational numbers

Step-by-step explanation:

Whole numbers are not closed under subtraction operation because when any two whole numbers are considered and from them one is subtracted from the other, the difference so obtained is not necessarily a whole number.

Irrational numbers are "not closed" under addition, subtraction, multiplication or division