Given $P(A)=\large\frac{3}{5}$ and $P(B)=\large\frac{1}{5}$.Find P(A or B),if $A$ and $B$ are mutually exclusive events .

Question

$\begin{array}{1 1}(A)\;\large\frac{4}{5}\\(B)\;\large\frac{2}{5}\\(C)\;\large\frac{6}{5}\\(D)\;\text{None of these}\end{array} $