choose the right answer

Question B10 If A = {a,b} and B = {b,c}, what is A-B and what is B - A? ("-" means difference, ref Formula Booklet) a) b) c) d) A-B = {a,b} and B-A = {b,c} A-B = {b} and = B - A = {b} A - B = {c} and = B - A = {a} A-B = {a} and = B - A = {c} Question B11 If A = {1, a} and B = {a ,b}, what is (B2) (A.B)? ("n" means intersection) a) b) {ab, ba} {aa, ab} {1, a, aa, ab) {, a, b, aa, ab, bb, ba} c) d)