Aufgabe:
A = {n ∈ ℕ | ∃m ∈ ℕ: n = 3m}
B = {n ∈ ℕ | ∃m ∈ ℕ, ∃k ∈ {1, 2, 3, 4, 5, 6, 7, 8}: n = 9m + k}
C = {n ∈ ℕ | ∃m ∈ ℕ: n3 = 3m}
D = {n ∈ ℕ | ∀m ∈ ℕ, ∃k ∈ {1, 2}: n = 3m + k}
Welche Aussage ist falsch?
(A) B ⊂ ℕ \ D
(B) C ⊂ A
(C) B ∩ (ℕ \ C) ⊂ D
(D) ℕ \ D ⊂ A ∪ B
