Ravi and his friends are playing a game on real numbers, one person have to pick a token 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. Ravi picked up a card "The ratio of non-zero rational and irrational number is"
2. David picked up a card "The sum of rational and irrational number is"
3. Kevin picked up a card "The product of \(a+\sqrt{b}\) and \(a-\sqrt{b}\), where \(a\) and \(b\) are integer is"
4. Rahul picked up a card " The ratio of two irrational number is"