Q.

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

A. 3
B. 4
C. 2
D. 5
Answer» C. 2
Explanation: 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.
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