Thank you for viewing! This is a set of three books: a Mathematics C textbook, PRIME, and the PRIME answer key. The area where the previous owner's name was written on the back cover of the answer key has been cut out with a cutter. Please check the second photo. Please purchase only if you are not concerned about this. I have checked for any writing and found none, but I apologize if I missed anything. #Mathematics #Calculation #GetSmarter #AdvanceStudy #Learning #Study #EntranceExam #SelfStudy #HighSchoolStudent #Textbook #TokyoShoseki #Prime