Question 184729
*[Tex \LARGE A=\left\{x\|x\in\mathbb{N}\ \ and \ \ 13<x<18\right\}]



*[Tex \LARGE A=\left\{14, 15, 16, 17\right\}]



*[Tex \LARGE B=\left\{12,13,14,15,16,17,18\right\}]



Notice how ALL of the elements of set A are also elements of set B, so this shows us that set A is a subset of set B (ie all of A is in B). So *[Tex \LARGE A \subseteq B]


Note: the two sets A and B are NOT equal since set B has the element 12 (but set A does NOT have the element 12)