Question

All logic operations can be obtained by means of ____________

(a) AND and NAND operations

(b) OR and NOR operations

(c) OR and NOT operations

(d) NAND and NOR operations

I have been asked this question in an interview.

This is a very interesting question from Procedure for the Design of Combinational Circuits topic in chapter Arithmetic Circuits of Digital Circuits

Answer 1

Right answer is (d) NAND and NOR operations

The explanation: Since, the logic gates NOR  and NAND are known as universal logic gates, therefore it can be used to design all the three basic gates AND, OR and NOT. Thus, it means that any operations can be obtained by implementation of these gates.