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Let N N be the set of natural numbers an...

Let `N N` be the set of natural numbers and R be a relation on `N NxxN N` defined by,
(a,b) R (c,d) `to` ad =bc , for all (a,b) and (c,d) `iN N NxxN N` .
Show that R is an equivalence relation on `N NxxN N`.

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