1. Write simple JavaScript with HTML for arithmetic expression evaluation and message printing.
<!DOCTYPE HTML>
<html>
<html>
<head>
<script type="text/javascript">
var a=20, b=10;
var add=a+b;
var add=a-b;
var add=a*b;
var add=a/b;
window.alert("Arithmetic opreation");
window.alert("Addition of a+b="+add);
window.alert("Subtraction of a-b="+sub");
window.alert("Multiplication of a*b="+mul");
window.alert("Division of a/b="+div");
</script>
</head>
</html>
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