How to add a style using jQuery to the 3rd, 6th, etc. (n * 3) elements within a div?
<p>I'm designing a website with divs with the following fashion:</p>

<pre><code>&lt;div id="showcase"&gt;
 &lt;div class="project"&gt; &lt;!-- this is the first row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the first row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the first row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the second row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the second row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the second row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the third row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the third row --&gt;
 &lt;div class="project"&gt; &lt;!-- this is the third row --&gt;
 &lt;/div&gt; 
&lt;/div&gt;
</code></pre>

<p>I want to remove right margin to the "last" div of a row (each row has 3 divs).</p>

<p>Any suggestions to accomplish this?</p>
