If $f ( w , x , y , z ) = ( \overline{\bar { x } + y \bar { z }} ) + ( \bar { w } x )$

Short Answer

If $f ( w , x , y , z ) = ( \overline{\bar { x } + y \bar { z }} ) + ( \bar { w } x )$ , find $f ( 1,1,1,1 )$