Question

Use Karnaugh map to find a minimal sum for: 

E = x’yz + x’yz’t + y’zt + xyzt’ + xy’z’t

Answer 1

Let us use Karnaugh map to find a minimal sum for $E = x'yz + x'yz't + y'zt + xyzt' + xy'z't$ :

It follows that the Karnaugh map contains four rectangles $2\times 1$, and hence minimal sum is $yzt'+x'yt+xy't+y'zt$