Reddit reviews Enumerative Combinatorics (Cambridge Studies in Advanced Mathematics)
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Used Book in Good Condition
As I see it there are four kinds of books that fall into the sub $30 zone:
You can get a lot of great books if you are willing to spend a bit more however. For example, Hardy and Wright is an excellent book (and if you think about it: is a 600 page book for $60 really more expensive than a 300 page one for 30?). Richard Stanley's books on combinatorics: Enumerative Combinatorics Vol. I and Algebraic Combinatorics are also excellent choices. For algebra, Commutative Algebra by Eisenbud is great. If computer science interests you you can find commutative algebra books with an emphasis on Gröbner bases or on algorithmic number theory.
So that's a lot of suggestions, but two of them are free so you can't go wrong with those.
combinatorics e.g http://www.amazon.com/Enumerative-Combinatorics-Cambridge-Advanced-Mathematics/dp/1107602629
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