# Labelling a Circuit Diagram

1. Oct 21, 2014

### Vishera

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

The multiplexer that is closest to the top of the page has ~x3 as an input but I am not allowed to use the negation of a logical variable as an input. Any way to get rid of this negation?

2. Oct 23, 2014

### .Scott

It's tough to give you assistance on this without giving you too much of a clue.

Notice that the only way you can invert a signal is by using a multiplexer. Also, the solution I found is based on $x_3(\bar{x}_2+x_1) + \bar{x}_3x_2$.