title: How to set default value in md-select
body: <p>This is my angular code I want to set default value as 300mb </p>
  
  <pre><code>&lt;label &gt;RAM&lt;/label&gt;
    &lt;md-select ng-model="RAMVal"&gt;
      &lt;md-option value="300mb" ng-selected="index == 1"&gt;300mb&lt;/md-option&gt;
      &lt;md-option value="400mb"&gt;400mb&lt;/md-option&gt;
    &lt;/md-select&gt;
  </code></pre>