Question

Sendo A = { X E IN / X < 6 } , B = { X E Z / - 1 < X < 4 } + C = { X E Z - 3 < X < 5 } , determine ?

a : A U B U C
b : A ∩ B ∩ C

Answer 1

 Oi Lay,

A = {5, 4, 3, 2, 1, 0}
B = {0, 1, 2, 3}
C = {- 2, - 1, 0, 1, 2, 3, 4}

=> A U B U C = {- 2, - 1, 0, 1, 2, 3, 4}

 Ou,

=> A U B U C = {X E Z | - 3 < X < 5}


 b)

=> A ∩ B ∩ C = {0, 1, 2, 3}

 Ou,

=> A ∩ B ∩ C = {x E N | x < 4}