Prove that $\mathbb{Q}^n$is dense subset of $\mathbb{R^n}$ using the fact that $\mathbb{Q}$ is dense subset of $\mathbb{R}$
I know that $\mathbb{Q}$ is dense subset of $\mathbb{R}$ That is, between any two real numbers, there exists a rational number
then how to prove that $\mathbb{Q}^n$is dense subset of $\mathbb{R^n}$