Question

suppose U= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} is the universal set, and P= {1, 4, 9}. What is P'?

Answer 1

P' is the set of everything you find in set U but NOT in set P

So what I like to do is start out with set U like so

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

then erase the elements 1, 4, 9 because they are found in set P. You will then get this new set P'

P' = {2, 3, 5, 6, 7, 8, 10} ... notice how 1,4,9 is NOT in this set

Answer 2

Side Note: P' is "P prime" and it's basically the complete opposite of set P. Whatever is in P will NOT be in P' (or vice versa).