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when we add and substract any number

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"substract" is not a word, and in any case, subtraction is not commutative.

A binary operation ~, acting on a set, S, is commutative if for any two elements x, and y belonging to S,

x ~ y = y ~ x

Common binary commutative operations are addition and multiplication (of numbers) but not subtraction nor division.

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Q: Explain when an binary operation is commutative?
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