如题！怎么找到这个随机数值范围？
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<title>抽奖</title>
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<style type="text/css">
body{background-color:#fff;text-align:center;padding-top:50px;}
#Result{border:3px solid #40AA53;margin:0 auto;text-align:center;width:400px;padding:50px 0;background:#efe;}
#ResultNum{font-size:50pt;font-family:Verdana}
#Button{margin:50px 0 0 0;}
#Button input{font-size:40px;padding:0 50px;}
#btn{background-color:#40AA53;border:1px solid #40AA53;width:20%;height:45px;margin:0em auto;font-size:1em;border-radius:2.5px;-moz-border-radius:2.5px;-webkit-border-radius:2.5px;color:#FFF;}
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<h1 style="color:#40AA53">抽奖结果</h1>
<div id="Result" style="color:#40AA53">
<span id="ResultNum">0</span>
</div>
<div id="Button">
<input type='button' id="btn" value='开始' onclick='beginRndNum(this)'/>
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