<ul>
<li>liste 1</li>
<li>liste 2</li>
<li>liste 3</li>
<li>liste 4</li>
<li>liste 5</li>
<li>liste 6</li>
<li>liste 7</li>
</ul>
li:nth-last-child(2n+1){
color: red;
}
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