A team of medical students doing their internship have to assist during surgeries at a city hospital.The probabilities of surgeries rated as very complex,complex,routine,simple or very simple are respectively 0.15,0.20,0.31,0.26,0.08.Find the probabilities that a particular surgery will be rated routine or simple

Question

$\begin{array}{1 1}(A)\;0.67\\(B)\;0.57\\(C)\;0.87\\(D)\;\text{None of these}\end{array} $