Question

Dacă A = {xEN) x s 4}, calculaţi: A U N, A N N, A - N, N – A.​

Answer 1

A  = {x ∈ ℕ⏐x ≤ 4}

⇒ A = {0,1,2,3,4}

a) A ∪ ℕ = {0,1,2,3,4} ∪ ℕ = ℕ

b) A ∩ ℕ = {0,1,2,3,4} ∩ ℕ = {0,1,2,3,4}

c) A - ℕ = {0,1,2,3,4} - ℕ = ∅

d) ℕ - A = ℕ - {0,1,2,3,4} = {5,6,7,8,9,10,11,... la infinit}