3 Sketch the following sets of reals a The set A represented by the union of intervals 1 2 and 4 6 b the set B represented by the intersection of intervals 3 1 and 2 5 c the set C represented by the union of intervals 3 2 and 4 d the set D represented by the intersection of intervals 1 and 0 5 e the set E represented by the union of the interval 1 4 and the set of rational numbers in the open interval 4 6