a) and b)

Demonstrate the validity of the following identities by means of truth tables: (a) DeMorgan's theorem for three variables: (x + y + z), 2.1 x,y,z, and (xyz)' = x, + y+z (b) The distributive law: x + yz = (x + y)(x + z) (c) The distributive law: x(y + z)-xy + xz