Equation from Schematic

Look at the figures on page 53, and work out the combinations of x,y or x,y,z necessary to write the equation.

Page 53, Exercise 3.20

Exercise 3.21 Equation from schematic, I. Write down a simplified Boolean expression for the functions computed by the logic circuit of Figure 3.10b

Exercise 3.22 Equation from schematic, I. Write down a simplified Boolean expression for the functions computed by the logic circuit of Figure 3.10c

Figure 3.10. Logic circuits for Exercises 3.20, 3.21, and 3.22