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Let \(\mathbb{Z}\) be the set of integers. Which of the following propositions is true?
\(\forall n \in \mathbb{Z}\), \(n^2 > 0\).
\(\exists n \in \mathbb{Z}\), \(n+1 = n\).
\(\forall n \in \mathbb{Z}\), \(\sqrt{n}\) is a real number.
\(\exists n \in \mathbb{Z}\), \(n^2 = n\).
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