Use mathematical induction to show the following: (20 points) "iro (21 + 1) = (n+1)for no Let A = {2, 3, 5, 7, 9} Let B = = {0, 1, 2, 3, 4} Let C = {6, 7} Write down A-B. (5 points) Write down AUB. (5 points) Write down AC (concatenation). (5 points)