If \(P\) \(=\) \(\{\)\(y\) : \(y\) \(=\) , \(n \in \mathbb{W}\) and \(n \le 3\}\), \(Q\) \(=\) \(\{\)\(y\) : \(y\) \(=\) , \(n \in \mathbb{N}\) and \(n \le 4\}\) and \(R\) \(=\) \(\{\)\(0\), \(1\), \(2\), \(4\), \(7\)\(\}\), then evaluate the following:
(i) Associative property of union of sets:
(ii) \((\)\(P\) \(\cup\) \(Q\)\()\) \(\cup\) \(R\) \(=\) .
[Note: Insert your answer in ascending order]