Choose the correct answer.
 
1. Which of the following is irrational?
 
2. A rational number between \(\sqrt{2}\) and \(\sqrt{3}\) is
 
3. The value of \(1.999...\) in the form of \(\frac{p}{q}\), where \(p\) and \(q\) are integers and \(q \neq 0\), is