Due to me having no idea what the search term is, I had to figure out for myself the probability of rolling at least one 1 on multiple dice. I think it's (m^n - (m - 1)^n)/m^n
, where m is the number of sides on each die and n is the number of dice. It's one of those things where you figure out the possibility of the complement not happening, then subtract that from 1.