Sets

\[A=\{x:x\text{ is a positive factor of}\hspace{0.5em}18\},\] \[B=\{x:x\text{ is a positive factor of}\hspace{0.5em}24\}.\]

1. List \(A\) and \(B\).

2. Find \(A\cup B\).

3. Find \(n(A\cup B)\).

4. A student calculates \[ n(A\cup B)=6+8=14. \]

   Identify the elements counted twice and correct the calculation.