3) (20 pts) Let S = {2, 3, 5} and T = {1, 2, 4, 6}. Explicitly list the members of the following sets: S UT, SOT. S-T, S XT, TXS, S(S) and f(T). 4) (20 pts) Using proof by contradiction, prove the following assertion about finite sets A and B: If A U B = A n B, then A = B. Once you set up the contradiction, you should have to investigate two cases