Dados os intervalos I = [2; 7] e J= ]5; 9[, determine I ∩ J
{x ∈ R / 2 < x ≤ 9}.
{x ∈ R / 5 < x < 7}.
{x ∈ R / 2 < x ≤ 5}.
{x ∈ R / 5 < x ≤ 7}.
{x ∈ R / 5 < x < 9}.