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<div id="div1">
<input type="radio" name="radio1" value="1" checked="checked" />
<input type="radio" name="radio1" value="2" />
<input type="radio" name="radio1" value="3" />
</div>
<div id="div2">
<input type="radio" name="radio2" value="1" checked="checked" />
<input type="radio" name="radio2" value="2" />
<input type="radio" name="radio2" value="3" />
</div>
<div id="div3">
<input type="radio" name="radio3" value="1" checked="checked" />
<input type="radio" name="radio3" value="2" />
<input type="radio" name="radio3" value="3" />
</div>
<div id="div4">
<input type="radio" name="radio4" value="1" checked="checked" />
<input type="radio" name="radio4" value="2" />
<input type="radio" name="radio4" value="3" />
</div>
$("input[name="+num+"][checked]").val();