There is duplicate content and it is a problem for SEO.
site.com/categoryname and site.com/questions/categoryname have the same content.
site.com/categoryname and site.com/unanswered/categoryname have the same content too.
¿How can i redirect all that url with 301 to only site.com/categoryname ?
Or how can i add canonical tag if i want that the principal url is site.com/categoryname
Sorry for my bad english, i speak spanish and used GTraslate.