I wouldn't buy a different-edition of a math book (since the class would take homework questions straight from the book), but I don't see the difference in an 8th and a 9th edition of a Biology textbook.
Have you bought older editions of a textbook?
Did it end up mattering?Have you bought older editions of a Textbook required for a college course?
It didnt matter at all.
It helps to ask the teacher what edition He or she uses. Many teachers do not use the newest edition of the textbook on sale, and base thier syllabus/homework on the edition THEY use personally.
For instance, My calculus teacher used the third edition or a textbook ( I bought on amazon for 1.73) but was telling us about the textbook sold in the campus bookstore. She used the 3rd edition , so I bought that and it made no difference.
Even better, you can use inter-library-loan at your school to order the book for afew weeks.
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