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What is the minimum number of NAND gates required to implement an EXOR gate?

What is the minimum number of NAND gates required to implement an EXOR gate? Correct Answer 4

We can implement an EXOR gate with a minimum of 4 NAND gates. However, when we follow the conventional way to convert an EXOR logic into the NADN logic, then the number of logic gates required is 5, but 1 of them is redundant and therefore, we can implement EXOR get by using 4 NAND gates.

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