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Which of the following are known as universal gates?

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Which of the following are known as universal gates?

(a) NAND & NOR

(b) AND & OR

(c) XOR & OR

(d) EX-NOR & XOR

The question was posed to me in unit test.

Origin of the question is Logic Gates and Networks topic in section Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

1 Answer

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The correct answer is (a) NAND & NOR

Easiest explanation: The NAND & NOR gates are known as universal gates because any digital circuit can be realized completely by using either of these two gates, and also they can generate the 3 basic gates AND, OR and NOT.

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