angularjs custom services tutorial

<!DOCTYPE html>
<html>
   <head>
   <title>Wikitechy AngularJS Tutorial</title>
   <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.min.js"></script>
   </head>
   <body>
   <div ng-app="myApp" ng-controller="serviceCtrl">
   <h3> Multiplication of two number using Custom Service in AngularJS</h3>
   <p>Multiply value of 10 and 50 is <b>{{mul}}</b> </p>
   </div>
   <script>
   var app = angular.module('myApp', []);
   app.service('multiply', function() {
   this.myFunc = function (a,b) {
   return a*b;
   }
   });
   app.controller('serviceCtrl', function($scope, multiply) {
   $scope.mul = multiply.myFunc(10,50);
   });
   </script>
   </body>
</html>