Why NAND and NOR are universal gates?

Related questions

1. How many NOR gates are required for Xnor?
2. What is EX OR gate and ex NOR gate?
3. How XOR gate is used as an inverter?
4. Which gate is best used as a basic comparator?
5. Is XOR a basic gate?
6. How many NOR gates are required for and gate?
7. What are the 3 basic logic gates?
8. What does Xnor mean?
9. What is the symbol of XNOR gate?
10. Can a NOR gate be used as an inverter?

Tags

1. #means
2. #bubbled
3. #using
4. #actually
5. #combination
6. #called
7. #gates
8. #implemented
9. #because
10. #inputs
11. #inverted
12. #derived
13. #universal
14. #other