Let u = Z, a = {x | x = 2K, K ∈ Z}; b = {x | x = 2K + 1, K ∈ Z} find CUA, Cub? Let u = Z, a = {x | x = 2K, K ∈ Z}; b = {x | x = 2K + 1, K ∈ Z} find CUA, Cub? It's urgent

Let u = Z, a = {x | x = 2K, K ∈ Z}; b = {x | x = 2K + 1, K ∈ Z} find CUA, Cub? Let u = Z, a = {x | x = 2K, K ∈ Z}; b = {x | x = 2K + 1, K ∈ Z} find CUA, Cub? It's urgent

CuA=B,CuB=A
Idea: from a = {x | x = 2K, K ∈ Z}, we know that a is all even numbers, then CUA is all odd numbers
B = {x | x = 2K + 1, K ∈ Z} we know that B is all odd numbers, then cub is all even numbers