f(1,Y,1) = Y’ (not gate realisation)
f(f(1,x,1),1,z) = (x’)’z = xz (AND gate realization)
Therefore from the given f(x,y,z) we can get AND+NOT = NAND gate so, Universal
any thing can be created .
g(x,y,z) = x’y(z+z’) + xy
= x’y + xy
= y
so, g(x,y,z) = y
we can’t create any thing from here