Axioms of Probability

Resources: page=17

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$$\begin{array}{rl}& 1.\text{Pr}\{E\}\in \mathbb{R},\text{Pr}\{E\}\ge 0\\ & 2.\text{Pr}\{\Omega \}=1\\ & 3.\text{For any sequence of disjoint events }{E}_1,\dots ,E_n\text{ we have:}\end{array}$$ $$\text{Pr}\{{\cup }_{i=1}^n{E}_i\}=\sum _{i=1}^n\text{Pr}\{E_i\}$$