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<!DOCTYPE html>
<html>
<body>

<p>
The global function (myFunction) returns the product of the arguments (a ,b):
</p>

<p id="demo"></p>

<script>
function myFunction(a, b) {
    return a * b;
}
document.getElementById("demo").innerHTML = myFunction(10, 2); 
</script>

</body>
</html>