<p>Hoping to start college in a few years for math.</p>

<p>Disclaimer:</p>

<p><strong>I'm working through Rudin's "Principles of Mathematical Analysis" on my own, so I don't want the full answer. I'm only looking for a <a href="http://meta.math.stackexchange.com/q/11258/93114">hint</a> on this problem.</strong></p>

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