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Let A=Nuu{0}xxNuu{0} and let * be a bina...

Let `A=Nuu{0}xxNuu{0}` and let * be a binary operation on `A` defined by `(a ,\ b)*(c ,\ d)=(a+c ,\ b+d)` for all `(a ,\ b),\ (c ,\ d) in Adot` Show that * is commutative on `Adot`

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