union of events

A sample space has two events A and B such that probabilities $$P\,(A\, \cap \,B)\, = \,1/2,\,\,P(\overline A )\, = \,1/3,\,\,P(\overline B )\, = \,1/3$$. What is P $$P\,(A\, \cup...

$${{E_1}}$$ and $${{E_2}}$$ are events in a probability space satisfying the following constraints: $$ \bullet $$ $$\Pr \,\,({E_1}) = \Pr \,({E_2})$$ $$ \bullet $$ $$\Pr \,\,({E_1}...