(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Prove that [tex] \mathbb Z^{+} X \: \mathbb Z^{+} X \: \mathbb Z^{+} [/tex] is countable, where X is the Cartesian product.

2. Relevant equations

3. The attempt at a solution

I'm lost as to where to start proving this.

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# Homework Help: Prove is countable

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