railway DFCCIL Executive 2025 Mock Test Digital Electronics Combinational Circuits Realization of Logic Gates
Which of the following are universal gates?
1. AND
2. NAND
3. OR
4. NOR
5. NOT
1
1, 2, 3, 4 and 5
2
1, 3 and 4 only
3
2, 3 and 5 only
4
2 and 4 only