Question 704176
<img src="http://latex.codecogs.com/gif.latex?B = \{14,15,16,17,18,19,20,21\}" title="\{x | 14 \le x \le 21, x \in \mathbb{N}\}" />



<img src="http://latex.codecogs.com/gif.latex?B = \{x | 14 \le x \le 21, x \in \mathbb{N}\}" title="\{x | 14 \le x \le 21, x \in \mathbb{N}\}" />


Note: the fancy looking "N" is the set of natural numbers (ie positive whole numbers)