Question

[T] Find $\mathbb{Q}\cup \mathbb{N}$ ?

Answer 1

$\N = \{0, 1, 2, 3, …\},$ the set of all natural numbers.

$Q= \{p∕q ∣ p ∈ \Z, q ∈ \Z, and \ q\not=0\}$ and q ≠ 0}, the set of all rational numbers.

Then

$$Q∪\N=Q$$