Prove that 3Z is an infinite set

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We known that $\Z = \{ ... , - 3,-2,-1,0,1,2,3, ... \}$ .

Hence, $3\Z = 3 \times\{ ... , - 3,-2,-1,0,1,2,3, ... \} = \{ ... , - 9,-6,-3,0,3,6,9, ... \}$ .

By completeness property of real numbers, for every $k \in \R$ , $\exist \ n \in \Z : n \geq k$ . Hence, $\Z$ is an infinite set.

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