3-O conjunto A={x∈N/ 5<x<9} escrito por extenso é:

a){5,6,7,8,9}
b){6,7,8,9}
C){5,6,7,8}
d){6,7,8}
e){5,6,7}

4-O conjunto diferença de A={-1,0,1,2,3} e B={1,2,3,4,5}, A - B, é:

a) {0,1,2,}
b){4,5}
C){-1,0}
d){-1,0,4,5}
e){0,1}

5- A intersecção dos conjuntos A={-2,-1,0,1,2,3} B={2,3,4,5,6} e C={-3,0,1,2,3,5,6}, A∩B∩C, é:

a){-1,01,2,3}
b){2,3,4}
C){5,6}
d){2,3}
e){0,1}

6-A união dos conjuntos A={-3,-2,-1,0,1}, B={-4,-,3,1,2}, AUB é:

a){-3,-2,-1,0,1}
b){-4,-3,1,2}
c){-4,2}
d){-3,1,2}
e){-4,-3,-2,-1,0,1,2}​