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Let ={|3}A={xR|x3Q} be a set. Is A countable? Justify the answer by showing the explicit formula for the bijection (no need to prove bijectivity )

Let ={|3}A={xR|x3Q} be a set. Is A countable? Justify the answer by showing the explicit formula for the bijection (no need to prove bijectivity ) or prove that no such bijection exists.

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