Question

If $P\left(E\right)=0.5$, then find probability of $P\left(\overline{B}\right)$

Answer 1

$\begin{array}{c}P\left(E\right)+P\left(B\right)=1\\ 0.5+P\left(B\right)=1\\ P\left(B\right)=0.5\\ P\left(\overline{B}\right)=1-P\left(B\right)\\ P\left(\overline{B}\right)=0.5\end{array}$

Hence, this is the answer.