Răspuns:
a) A={1,3,5,7}
B={2,4,5,7}
C={4,6,7,9}
b) A U B = 1 2 3 4 5 7
A U C = 1 3 4 5 6 7 9
B U C = 2 4 5 6 7 9
A-B = 1 3
A-C= 1 3 5
B-C= 2 5
A U B U C = 1 2 3 4 5 6 7 8 9
A INTERSECT CU B SI CU C = 7
A U C - B = 1 3 4 5 6 7 9 - 2 4 5 7 = 1 3 6 9
