<html>
<head>
<title>sum of n numbers</title>
<script type="text/javascript" >
var num,i,n,sum=1;
n=window.prompt("enter n value:","0");
num=parseInt(n);
document.write(sum);
for(i=2;i<=num;i++)
{
document.write("+"+i);
sum=sum+i;
}
document.write("="+sum);
</script>
</head>
<body>
<p>click refreshto runscript agine</p>
</body>
</html>
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