title: Get random number between two intervals
body: <p>I would like to get a random number between two intervals, 1, 4 and 8, 16</p>
  
  <p>To get a random number between one interval I would have to do this:</p>
  
  <pre><code>randNumber = random(1, 3);
  </code></pre>
  
  <p>What if I wanted my variable to have the possibility to be a number between 8 and 16 too, and not only between 1 and 4?</p>
  
  <p>Thank you.</p>