i’m taking it rn too with him and i’ll agree that even though he kept saying “oh if you haven’t had previous experience with this material you’ll be fine” you definitely need a baseline foundation for even this first homework
i haven’t looked at our book yet for this class but i know the book for cs170 (https://www.amazon.com/Essential-Discrete-Mathematics-Computer-Science/dp/0691179298) covered things like set theory really well
also i would reach out to him and let him know how you’re feeling he def seems like the type of person who cares about his students although i could be wrong
hang in there, a lot of probability/stats is just simple math covered up by complicated looking expressions so just try to reason through things logically