angularjs ng-click function not working

  <a href="#" ng-click="myNum(l.GroupID)">{{l.Desc}}</a>

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 $scope.mypage = 1;  // Need to change here and submit.
                                               
                                              $scope.myNum = function (num) {

                                                   $scope.mypage = num;
                                                   alert($scope.mypage);
                                                   $scope.todo.items.push({GroupID: num, done: false });
                                         
                                               }

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