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How many NOT gates are required for the construction of a 4-to-1 multiplexer?

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How many NOT gates are required for the construction of a 4-to-1 multiplexer?

(a) 3

(b) 4

(c) 2

(d) 5

This question was addressed to me in homework.

My question is taken from Multiplexers (Data Selectors) in chapter Combinational Circuits of Digital Circuits

1 Answer

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Best answer
Right choice is (c) 2

To explain I would say: There are two NOT gates required for the construction of 4-to-1 multiplexer. x0, x1, x2 and x3 are the inputs and C1 and C0 are the select lines and M is the output.

The diagram of a 4-to-1 multiplexer is shown below:

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