Probability

The probability that at least one of the events \(E_1\) and \(E_2\) occurs is 0.6. If the simultaneous occurrence of \(\mathrm{E}_1\) and \(\mathrm{E}_2\) is \(0.2, \mathrm{P}\left(\mathrm{E}_1^{\prime}\right)+\mathrm{P}\left(\mathrm{E}_2^{\prime}\right)=\)