title: Reduce Truth table with Karnaugh Map
body: <p>I am trying to reduce a boolean expression with a K-map. But when I make the map I end up with three true values which is not possible to make a map with.</p>
  
  <p>Is there a way to simplify this map?</p>
  
  <p>The original expression was:</p>
  
  <pre><code>Y1 = A1 B1 A2' B2' + A1 B1 A2 B2' + A1 B1 A2' B2
  </code></pre>
  
  <p>Thanks a lot for the help. The picture shows the truth tables and the k-map</p>
  
  <p><a href="https://i.stack.imgur.com/Hsdty.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Hsdty.png" alt="enter image description here"></a></p>