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Let A=N cup {0} xx N cup {0} and Let * ...

Let `A=N cup {0} xx N cup {0}` and Let * be a binary operation on a defined by `(a, b) **(c, d)=(a+c, b+d)` for (a, b), (c, d) `in `N. Show that.
(i) B commutative as A
(ii) * is associative on A

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