Question

dados os conjuntos A={1,3,4,7,8},B={2,4,6,7},C={2,3,5,7,8},qual e o conjunto (A U B)-C ?

Answer 1

(A U B) = {1,2,3,4,6,7,8}
{1,2,3,4,6,7,8} - {2,3,5,7,8} = {1,4,6}