A [b]set [/b]is an [i]unordered collection of objects[/i], usually called [i]elements [/i]or [i]members [/i]of the set.[br][br]We can represent a set by [i]listing [/i]its elements, or by defining the [i]property [/i]of all the elements in the set (set-builder notation)[br][br]Example:[br][i]A[/i]={60, 62, 64, 66, 68, 70} and [br][i]A[/i]={[i]x[/i] | 60 ≤ [i]x [/i]< 71, [i]x[/i] is an even integer} [br]are two representations of the same set.[br][br]We can also represent sets visually, using [url=https://en.wikipedia.org/wiki/Venn_diagram]Venn diagrams[/url]: explore this representation in the app below. [br][br]