Angular JS - Code not working as expected

Question

I do not see any output produced. Can someone explain why?
https://code.sololearn.com/Wj7TghdzWDYr/?ref=app

Answer 1

You can't call the binomial( ) function before declaring it in the scope of AngularJS i.e., $scope!
https://code.sololearn.com/WL7Yr8EM9T8E/#html

Answer 2

Thanks Rahul