09-Dados os conjuntos A={0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,11}, B = {0, 1, 2, 3, 4} e C =

{2, 3, 4, 5, 6, 7, ,8 ,9, 10, 11,12, 13, 14, 15}, determine :

a) A – B.

b) C – A.

c) C – B.​