UPSKILL MATH PLUS

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If X = \{x: x is a multiple of 2, n \in \mathbb{N} and n \le 20\}, Y = \{x: x is a multiple of 3, n \in \mathbb{N} and n \le 20\} and Z = \{x: x is a multiple of 6, n \in \mathbb{N} and n \le 20\}, then find X\cup (Y \cap Z).
 
X \cup (Y \cap Z) = \{\}.
 
[Note: Enter the numbers in ascending order, also insert a comma to separate the numbers]