alleryIntegers are closed under an operation that natural numbers are not. Which?
ASubtraction
BAddition
CMultiplication
DExponentiation
Answer & Solution
Correct answer: A. Subtraction
1. Natural numbers are closed under addition and multiplication.
2. Adding zero and the negatives makes integers closed under subtraction too.
3. Addition and multiplication are shared, and exponentiation fails for integers.
_Source: Wikipedia, Integer, Algebraic properties_
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