Books for learning multinomial theorem

[Titan97]

Can you suggest any book for learning multinomial theorem and its application in permutation and combinations problems? I am also looking for a book for learning Permutations and Combinations. (Right now, I am using a problem oriented book by Marcus. But I want a book for learning the basics as well.)

 

[mathwonk]

have you looked at the wikipedia article?

https://en.wikipedia.org/wiki/Multinomial_theorem

 

[Titan97]

yes. I am weak in permutations and combinations. I can't find many books on this topic.