Which Of The Following Gates Serves As The Building Blocks Is Digital Circuits?

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Question

Which of the following gates serves as the building blocks is digital circuits?

easy

Solution

Correct option is

NAND and NOR gates

The OR or the AND or the NOT gates alone cannot give a different gate by repeated use, i.e., two or-more OR or AND or NOT gates do not yield a new gate. But the repeated use of NAND (or NOR) gates can give all other gates like OR, AND and NOT. Hence the NAND (or the NOR) gate serves as a building block in digital circuits.