Question

It takes three 2-1 MUX's to build a 4-1 MUX. How many 2-1 MUX's does it...

It takes three 2-1 MUX's to build a 4-1 MUX. How many 2-1 MUX's does it take to build an 8-1 MUX?

4

5

6

7

none of these
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Answer #1

Answer:7

By solving it we get 7 as answer

It is nothing but

N1=required mux that is 8

N2= available mux that is 2

We have taken if from 8*1 and 2*1mux

First we have to do 8/2=4

Then we have to take the result that is and again divide by 2

4/2 =2

and again divide 2/2=1

Add them that is 4+2+1=7

We require 7. 2*1 mux to build 8*1 mux

Refer this image for more clarification

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