A book (writing, written) in haste may well have a lot of mistake.
What is the answer? (I don't know which one is correct now.) Most of us (non-native speaker) say 'written' is correct(the book (which is) written in haste ~) but someone says the answer is 'writing'. (Actually he presented this question.)
Is 'writing' the answer? or is he only misthinked the answer?