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Let x be the set consisting of the first 2018 terms of the Arithmetic Progression

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Let $x$ be the set consisting of the first 2018 terms of the Arithmetic Progression $ 1, 6, 11, ... $ and $y$ be the set consisting of the first 2018 terms of Arithemetic Progression $9, 16, 23, ...$ Then the Number of Elements in the set $x {\displaystyle \cup} y $ is ?

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