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<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<script>
function facto() {
var numero, resp;
numero = document.getElementById('num').value;
resp = parseInt(numero);
for (var i = numero-1; i > 0; i--) {
resp *=i;
}
document.getElementById('respuesta').value = resp;
}
</script>
<input type="text" id="num"><br><br>
<input type="submit" onclick="facto()" value="calcular"> <br><br>
<input type="text" id="respuesta">
</body>
</html>
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