Ram and his friends are playing a game on real numbers, one person have to pick a card from the basket and answer the questions related to real numbers. The cards are picked by \(4\) persons and the questions on the real numbers are shown below.
1. Ram picked up a card "The product of rational and irrational number is"
2. Saran picked up a card "The sum of rational and irrational number is"
3. Sam picked up a card "The product of \(a+\sqrt{b}\) and \(a-\sqrt{b}\), where \(a\) and \(b\) are integer is"
4. Karan picked up a card " The sum of two irrational number is"