title: How to set the default value for radio buttons in AngularJS?
body: <p>I need to make a system to change the total price by number of tickets selected. I created some radio buttons to choose the number of ticket. The ploblem is that the default value is unset and the result is null on loading.</p>
  
  <pre><code>&lt;input type="radio" ng-model="people" value="1" checked="checked"&gt;&lt;label&gt;1&lt;/label&gt;
  &lt;input type="radio" ng-model="people" value="2"&gt;&lt;label&gt;2&lt;/label&gt;
  &lt;input type="radio" ng-model="people" value="3"&gt;&lt;label&gt;3&lt;/label&gt;
  &lt;ul&gt;
    &lt;li&gt;{{10*people}}€&lt;/li&gt;
    &lt;li&gt;{{8*people}}€&lt;/li&gt;
    &lt;li&gt;{{30*people}}€&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p><a href="http://jsfiddle.net/Nuw9R/">Please see my jsfiddle.</a></p>