## PHYS345 Electricity and Electronics

**Hint for 13-30**
Boxing the ones yields an expression involving just three gates when the **x**
is taken as **1**. However, when the zeroes are boxed and the result NOTted,
as shown in the class example,
followed by several applications of DeMorgans' theorems, you can find an expression
using just two gates that will yield the desired truth table.

"http://www.physics.udel.edu/~watson/phys345/protected/exercises/hints/13-30.html"

Last updated Nov. 8, 1999.

Copyright George Watson, Univ. of Delaware, 1999.