A and the set B = {x, y}, then A X B is denumerable as well.

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I'm trying to prove that if given the innumerable set A and the set B = {x, y}, then A X B is denumerable as well. 

Proof: 

All I have so far is that, assuming A is denumerable, we can create the sequence A = a1, a2, a3, ... By definition of cross-product, we can then form the sequence A X B = a1x, a1y, a2x, a2y, a3x, a3y, ...

It should be clear that this sequence includes every element of AXB as, as such, A X B is denumerable. 

 

I am not entirely sure that this argument is valid. 

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