Question

Help please! (The question will be attached to the comments box) :)))

Answer 1

ok so \[A \cup B=A+B-(A intersection B)\]
so let our A is { 3,3,2,3,9} and our B is { 3,3,2,6,5} so i think the union of two sets would be {3,2,6,5,9}..is it correct..??

Answer 2

\cap

Answer 3

\[C=\{1,2,3,4,5,6,7,8,9\}\]
\[\tilde~ \{3,2,6,5,9\} = C-\{3,2,6,5,9\}\]