this is a beautiful masterpiece from one of our Real FORUM EXPERT Hari shankar sir
this article is orginally composed by one of our real forum experts hari sir,
shamefully these days many forum experts are creating fake id and asking questions and answering (within seconds!) and then rating themselves !!!!!!!!! lol
ok lets come to the point
this article helps us in understanding the concept of generating function when ur provided by the recursive relations
Hope it helps u !
if u understand it and feel that u have really learnt a cool thing then rate the author !