Question

Cum este raspunsul la acesta tema?

Answer 1

A = {x ∈ ℕ*⏐x ≤ 4} = {1,2,3,4}

B = {x ∈ ℕ⏐ 2 ≤ x < 6} = {2,3,4,5}

C = {x ∈ ℕ⏐ 1 ≤ x ≤ 5} = {1,2,3,4,5}

card(A) = 4, card(B) = 5, card(C) = 5

a) 4 ∈ A (✓),  b) 3 ∈ A (✓),  c) 5 ∈ A (✕),

d) 5 ∈ B (✓),  e) 6 ∈ C (✕),  f) 0 ∈ C (✕),

g) {0,1} ⊂ A (✕),  h) {3,4,5} ⊂ B (✓),

i) B ⊂ C (✓),  j) B ⊂ A (✕),

k) {2,3,6} ⊂ B (✕),  l) {1,3} ⊄ B (✓).