Question 638912
The answer in set-builder notation is <img src="http://latex.codecogs.com/gif.latex?\large \{x | \ 5 \le x \le 7, \ x \in \mathbb{N} \ \}" title="\large \{x | \ 5 \le x \le 7 , \ x \in \mathbb{N} \}" />


So <img src="http://latex.codecogs.com/gif.latex?\large \{5, \ 6, \ 7\ \} = \{x | \ 5 \le x \le 7, \ x \in \mathbb{N} \ \}" title="\large \{x | \ 5 \le x \le 7, \ x \in \mathbb{N} \ \}" />