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Originally Posted by science4ever
hey ive got a bio volume 1 book edition 2 and i need edition 3...is there much of a difference? shud i buy edi 3 or keep my edi 2
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It depends on the book. You should compare the books in order to properly judge. You should also check the course outline or with the professor if the lecture content will be tested, the textbook material or a combination of both.
Sometimes the textbook is only used as a supplementary learning resource but is still required because the teacher takes material from the book to lecture and/or requires you to do readings.