From (complement UA)∩b = {7 }-A-There is no 7 in A, and there is 7 in B.
According to the complement set u (a ∪ b) = {2, 17}, there is no 2 and 17 in A and B.
From A∩ (UB) = {3 3,5}-A contains 3 and B does not contain 3,5.
1 1, 13, 19 is the intersection of a and b, so A = {3 3,5, 1 1, 13,19.
B={7， 1 1， 13， 19}