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# 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 .

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

Toolbox:
• The formula used to solve this problem is $P(A\cup B)=P(A)+P(B)-P(A \cap B)$
Given A and B are mutually exclusive events.
$\therefore$ Mutually exclusive means $P(A \cap B)=\phi$
$\therefore$ P(A or B)=$P(A \cup B)=P(A)+P(B)-P(A \cap B)$