Set of 3 problem books for learning the fundamentals and applications of mathematics. - Series: Mathematics I A, II B, C - Publisher: Kenkyusha Publishing - Language: Japanese - Contents: Problem books on the fundamentals and applications of mathematics - Number of books: Set of 3 C is unused. The other 2 books have some writing as shown in the second image, but it's not on every page, only some. They are in relatively good condition, but please purchase if you don't mind minor imperfections. There is a mark where a name sticker was removed from the answers for 2B. The name on the back of the answers for 1A has been erased with a black pen. Thank you for looking.