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(1) Closed Interval: Let a and b are two given real numbers such that $$\text{a}\,\text{}\,\text{b}$$ , then $$\left[ \text{a,}\,\text{b} \right]=\left\{ x:x\in \text{R},\,a\le x\le b \right\}$$ (2) Open Interval: Let a and b are two given real numbers such that $$\text{a}\,\text{}\,\text{b,}$$ then $$\left] a,b \right[$$ or $$\left( a,\,\,b \right)=\left\{ x:x\in \text{R},a<x<b \right\}$$ (3) Closed-open Interval: Let […]