- Title: Mathematics I+A - Title: Mathematics II+B - Title: Mathematics III+C - Publisher: Kenkyusha Publishing Thank you for viewing. These items have been mostly unused, but are second-hand and stored at home. Also, the name on the back cover of the answer key for IA has been blacked out. If you wish, I can apply a blank name sticker over the blacked-out area. Please purchase only if you understand this. Individual sales are also available. Immediate purchase is OK. If you would like to negotiate the price, please comment.