"The failure occurred from <i><b>2 out of the 5 samples</b></i> we received."<br/><br/>Do I need to add <b><i>the</i></b> here to make it <br/><br/>The failure occurred from <i><b>the</b></i> <i><b>2 out of the 5 samples</b></i> we received.<br/><br/>Articles are alway confusing, thanks in advance.