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let A = N xxN and * be the binary operat...

let `A = N xxN` and * be the binary operation on A defined by : (a,b) * (c,d) = (a+c,b+d)`. Show that * is commutative and associative. Find the identify element for * on A, if any.

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MODERN PUBLICATION-RELATIONS AND FUNCTION-EXAMPLE
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  2. Let '*' be a binary operation defined on Q. Find which of the followin...

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