Discussion Forum
Que.  Let f(w, x, y, z) = ∑(0, 4, 5, 7, 8, 9, 13, 15). Which of the following expressions are NOT equivalent to f? 
a.  x'y'z' + w'xy' + wy'z + xz 
b.  w'y'z' + wx'y' + xz 
c.  w'y'z' + wx'y' + xyz + xy'z 
d.  x'y'z' + wx'y' + w'y 
Answer:x'y'z' + wx'y' + w'y
