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What is the minimum number of two input NAND gates used to perform the function of two input OR gates?

What is the minimum number of two input NAND gates used to perform the function of two input OR gates? Correct Answer Three

Y = A + B. This is the equation of OR gate. We require 3 NAND gates to create OR gate. We can also write, 1st, 2nd and 3rd NAND operations as: Y = ((NOT A) AND (NOT B))’ = A’’ + B’’ = (A+B).

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