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Thanks bobbym for the link http://www.themathpage.com/aprecalc/factorial.htm
I know about mathisfun ,I meant some advance stuff
Now I got it thanks guys, it was so simple ,my book didnt have enough of factorials its more about permutation can you guys give me some resource on factorials...
Ok I have seen this in my book too but ,I didn't understood howexpands into ,is their any special rules or am I missing something very basic
So you just need to solve
I can't solve this one ...