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Explain Closure property under addition.
Closure property under addition :
Closure property says that if for any two natural or whole numbers a and b, $a+b$ is also a natural or whole number then the set of natural or whole numbers is closed under addition.
For example,
Take two numbers 4 and 5, $4+5=9$ which is a natural (whole) number. Therefore, Natural(Whole) numbers are closed under addition.
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