<html>
<head>
<script>
function factorial()
{
a = prompt("enter a number","");
fact = 1;
for(i=1;i<=a;i++)
{
fact =fact*i;
}
document.write("factorial of number is " +fact);
}
</script>
</head>
<body>
<button onclick="factorial()">Try it</button>
</body>
</html>
<head>
<script>
function factorial()
{
a = prompt("enter a number","");
fact = 1;
for(i=1;i<=a;i++)
{
fact =fact*i;
}
document.write("factorial of number is " +fact);
}
</script>
</head>
<body>
<button onclick="factorial()">Try it</button>
</body>
</html>
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