A Company Has Discovered a Way of Evaluating the Success $R$

Essay

A company has discovered a way of evaluating the success of both their radio and television advertising. If $R$ and $T$ are, respectively, the events that the radio advertising and television advertising are successful, $P(R)=0.62, P(T)=0.75$ , and $P(R \cap T)=\mathbf{0 . 4 3}$ .
-Using the situation above, state in words what probability is expressed by the following: $P\left(R \cup T^{\prime}\right)$ .