Syed, sometimes the published article in un-featured (not shown to the public) because HubPages thinks that it does not meet their standards.
Even if it does not meet all the requirements, it may still be featured if they think you have done a good-enough job.
Here is a link that states the requirements: http://hubpages.com/content/Learning-Center-Elemen...
At the extreme right of the article in the Account section, there will be a little white H in a little black circle if it is featured. If there is no H, redo the article comparing it with the standard requirements in the link. Good luck!