The Art of Problem Solving. im interesting in purchasing either the art and craft of problem solving by paul zeitz or the art of problem solving volume 2 by Ruscyzk. im leaning more towards the second book as it comes with a solution manual.. How to get Art of Problem Solving Books for free. Okay, so I am a fourteen year old girl, I don't want to wait till the last minute because my parents have already asked for the list and I have other stuff to do.. AoPS Academy Gaithersburg. 539.637.721.4.. which maths books should i buy. Art of Problem Solving I need LOTS of Christmas list ideas!. Volume 2.I am studying for AMC 10-12, what books should i buy? I am looking for one on combinatorics (see my profile for the question), can you guys think of another books I should buy to learn techniques from?. I DO NOT need books that have bunch of past questions. I NEED BOOKS THAT have advanced mathematical ideas !! -which will eventually