You got what you paid for. When the books are returned, it is the job of the person receiving the book back from the seller to check for stuff like that. I would consider it good fortune, hope the answers are right and go with it. Just don't sell yourself short. If you don't understand something, don't just use the answers and get by.
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A little rudeness and disrespect can elevate a meaningless interaction to a battle of wills and add drama to an otherwise dull day. Calvin
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