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Expressions are used to bind application data to html. Expressions are written inside double braces like {{ expression}}. Expressions behaves in same way as ng-bind directives. AngularJS application expressions are pure javascript expressions and outputs the data where they are used.

Using numbers
<p>Expense on Books : {{cost * quantity}} Rs</p>
Using strings
<p>Hello {{student.firstname + " " + student.lastname}}!</p>
Using object
<p>Roll No: {{student.rollno}}</p>
Using array
<p>Marks(Math): {{marks[3]}}</p>
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