(adsbygoogle = window.adsbygoogle || []).push({}); Prove that Cl(Q) = R in the standard topology

I'm really stuck on this problem, seeing as we haven't covered limit points yet in the text and are not able to use them for this proof. Can anybody provide me with help needed for this proof? Many thanks.

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# Homework Help: Closure of the Rational Numbers (Using Standard Topology)

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