title: Scheme explanation - cdr and car
body: <p>I've got this example :     </p>
  
  <pre><code>(apply + 2 (cdadr '(1 ((2 . 3) 4))))
  </code></pre>
  
  <p>This returns 6? Why is <code>(cdadr '(1 ((2 . 3) 4)))</code> 4??
  I don't get it.Shouldn't it be 3?</p>