Question

sendo a= {1 2 3 4 5} b= {3 4 5 6 7} e c= {5 6 7 8 9} determine:

A-C=
B-(A U C)=

Answer 1

A-C= { 1 2 3 4}
B-(A U C)= { / }

Answer 2

A-C = (1,2,3,4,5) - (5,6,7,8,9) = (1,2,3,4) .................... AUC = (1,2,3,4,5,6,7,8,9) então: B-(AUC) = (3,4,5,6,7) - (1,2,3,4,5,6,7,8,9) = ( )